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129-718: Norpipe is a subsea oil and natural gas pipelines system in the North Sea . It supplies oil from the Norwegian Ekofisk and associated fields in the North Sea to the United Kingdom and natural gas to Germany . The Norpipe oil pipeline starts at the Ekofisk 2/4-J facility. In addition to Ekofisk (Cod, Ekofisk, West Ekofisk, Tor, Albuskjell, Eldfisk, Edda, and Embla fields) the pipeline carries oil from Valhall , Hod, Gyda , Ula , Tambar, and Oselvar fields in
258-571: A Tuath . The North Sea has provided waterway access for commerce and conquest. Many areas have access to the North Sea because of its long coastline and the European rivers that empty it. There is little documentary evidence concerning the North Sea before the Roman conquest of Britain in 43 CE, however, archaeological evidence reveals the diffusion of cultures and technologies from across or along
387-738: A challenge to their dominance of the North Sea until the 20th century. Tensions in the North Sea were again heightened in 1904 by the Dogger Bank incident . During the Russo-Japanese War , several ships of the Russian Baltic Fleet, which was on its way to the Far East, mistook British fishing boats for Japanese ships and fired on them, and then upon each other, near the Dogger Bank, nearly causing Britain to enter
516-610: A major regional political player for another 150 years. The land that now comprises most of the Scottish Lowlands had previously been the northernmost part of the Anglo-Saxon kingdom of Northumbria , which fell apart with its Viking conquest; these lands were never regained by the Anglo-Saxons, or England. The upheaval and pressure of Viking raiding, occupation, conquest and settlement resulted in alliances among
645-562: A month by another Viking descendant, William , Duke of Normandy . Scotland took its present form when it regained territory from the Norse between the 13th and the 15th centuries; the Western Isles and the Isle of Man remained under Scandinavian authority until 1266. Orkney and Shetland belonged to the king of Norway as late as 1469. Consequently, a "long Viking Age" may stretch into
774-638: A more "rational" and "pragmatic" approach to historical scholarship. By the latter half of the 18th century, while the Icelandic sagas were still used as important historical sources, the Viking Age had again come to be regarded as a barbaric and uncivilised period in the history of the Nordic countries. Scholars outside Scandinavia did not begin to extensively reassess the achievements of the Vikings until
903-499: A receiving terminal at Emden in Germany . The diameter of pipeline is 36 inches (910 mm) and it has capacity of 16 billion cubic metres (570 billion cubic feet) of natural gas per year. The natural gas pipeline was commissioned in 1977 and will be in use until 2028. The start-up investment was 26.4 billion Norwegian krone. The pipeline is owned by Gassled and operated by Gassco . The technical service provider
1032-474: A result, Viking raiders found it easy to sack and then retreat from these areas which were thus frequently raided. The second case is the internal "push" factor, which coincides with a period just before the Viking Age in which Scandinavia was undergoing a mass centralisation of power in the modern-day countries of Denmark, Sweden, and especially Norway. This centralisation of power forced hundreds of chieftains from their lands, which were slowly being appropriated by
1161-728: A scribal error the Anglo-Saxon Chronicle dates this event to 787 rather than 789), but that incursion may have been a trading expedition that went wrong rather than a piratical raid. Lindisfarne was different. The Viking devastation of Northumbria 's Holy Island was reported by the Northumbrian scholar Alcuin of York , who wrote: "Never before in Britain has such a terror appeared". Vikings were portrayed as wholly violent and bloodthirsty by their enemies. Robert of Gloucester 's Chronicle, c. 1300, mentions Viking attacks on
1290-590: A serious attack was made on Lindisfarne's mother-house of Iona , which was followed in 795 by raids upon the northern coast of Ireland. From bases there, the Norsemen attacked Iona again in 802, causing great slaughter amongst the Céli Dé Brethren, and burning the abbey to the ground. The Vikings primarily targeted Ireland until 830, as England and the Carolingian Empire were able to fight
1419-717: A vast merchant marine, a large fishing fleet, powerful navy, and sophisticated financial markets made the Dutch the ascendant power in the North Sea, to be challenged by an ambitious England. This rivalry led to the first three Anglo-Dutch Wars between 1652 and 1673, which ended with Dutch victories. After the Glorious Revolution in 1688, the Dutch prince William ascended to the English throne. With unified leadership, commercial, military, and political power began to shift from Amsterdam to London. The British did not face
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#17327938397511548-725: A version of the economic model that points to new economic incentives stemming from a "bulge" in the population of young Scandinavian men, impelling them to engage in maritime activity due to limited economic alternatives. This era coincided with the Medieval Warm Period (800–1300) and stopped with the start of the Little Ice Age (about 1250–1850). The start of the Viking Age, with the sack of Lindisfarne, also coincided with Charlemagne 's Saxon Wars , or Christian wars with pagans in Saxony . Bruno Dumézil theorises that
1677-536: A volume of 54,000 cubic kilometres (13,000 cu mi). Around the edges of the North Sea are sizeable islands and archipelagos , including Shetland , Orkney , and the Frisian Islands . The North Sea receives freshwater from a number of European continental watersheds, as well as the British Isles . A large part of the European drainage basin empties into the North Sea, including water from
1806-620: Is 17 °C (63 °F) in the summer and 6 °C (43 °F) in the winter. The average temperatures have been trending higher since 1988, which has been attributed to climate change . Air temperatures in January range on average between 0 and 4 °C (32 and 39 °F) and in July between 13 and 18 °C (55 and 64 °F). The winter months see frequent gales and storms. The salinity averages between 34 and 35 grams per litre (129 and 132 g/US gal) of water. The salinity has
1935-585: Is ConocoPhillips. On 30 September 1995, a German cargo ship Reint collided with the Norpipe H7-platform in the German continental shelf . Only minimal damages to the platform, and no injuries to people were caused. The H7 platform has been off-the-service since 1999, and in 2007 a bypass pipe laid around the platform. North Sea Download coordinates as: The North Sea lies between Great Britain , Denmark , Norway , Germany ,
2064-562: Is a major fishery . The coast is a popular destination for recreation and tourism in bordering countries, and a rich source of energy resources, including wind and wave power . The North Sea has featured prominently in geopolitical and military affairs, particularly in Northern Europe , from the Middle Ages to the modern era. It was also important globally through the power northern Europeans projected worldwide during much of
2193-466: Is a series of asymmetrical trenches between 20 and 30 kilometres (12 and 19 mi) long, one and two kilometres (0.6 and 1.2 mi) wide and up to 230 metres (750 ft) deep. Other areas which are less deep are Cleaver Bank , Fisher Bank and Noordhinder Bank . The International Hydrographic Organization defines the limits of the North Sea as follows: On the Southwest. A line joining
2322-526: Is also home to marine mammals. Common seals , grey seals , and harbour porpoises can be found along the coasts, at marine installations, and on islands. The very northern North Sea islands such as the Shetland Islands are occasionally home to a larger variety of pinnipeds including bearded , harp , hooded and ringed seals , and even walrus . North Sea cetaceans include various porpoise , dolphin and whale species. Plant species in
2451-607: Is because of this, rather than the Norman conquest, that 1066 is often taken as the end of the Viking Age. Nineteen days later, a large army containing and led by senior Normans, themselves mostly male-line descendants of Norsemen, invaded England and defeated the weakened English army at the Battle of Hastings . The army invited others from across Norman gentry and ecclesiastical society to join them. There were several unsuccessful attempts by Scandinavian kings to regain control of England,
2580-780: Is bounded by the Orkney Islands and east coast of Great Britain to the west and the northern and central European mainland to the east and south, including Norway , Denmark , Germany , the Netherlands , Belgium , and France . In the southwest, beyond the Straits of Dover , the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via
2709-560: Is not easy to pin down a single date that applies to all the Viking world. The Viking Age was not a "monolithic chronological period" across three or four hundred years, but was characterised by various distinct phases of Viking activity. It is unlikely that the Viking Age could be so neatly assigned a terminal event. The end of the Viking era in Norway is marked by the Battle of Stiklestad in 1030, in which Óláfr Haraldsson (later known as Olav
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#17327938397512838-531: Is ongoing as to why the Scandinavians began to expand from the eighth through 11th centuries. Various factors have been highlighted: demographic, economic, ideological, political, technological, and environmental models. Barrett considers that prior scholarship having examined causes of the Viking Age in terms of demographic determinism, the resulting explanations have generated a "wide variety of possible models". While admitting that Scandinavia did share in
2967-468: Is operated by ConocoPhillips Skandinavia AS. The pipeline was commissioned in 1975. The Petroleum Safety Authority Norway has granted consent to use the pipeline until 2028. The Norpipe oil pipeline originally had two intermediate booster pump installations in the UK sector designated 37/4A and 36/22A, these were seldom used and were subsequently bypassed. The booster platforms were removed in 2009/10 as part of
3096-643: Is recorded to have killed more than 100,000 people. In 1362, the Second Marcellus Flood , also known as the Grote Manndrenke , hit the entire southern coast of the North Sea. Chronicles of the time again record more than 100,000 deaths, large parts of the coast were lost permanently to the sea, including the now legendary lost city of Rungholt . In the 20th century, the North Sea flood of 1953 flooded several nations' coasts and cost more than 2,000 lives. 315 citizens of Hamburg died in
3225-530: Is regarded as the beginning of the Viking Age. Judith Jesch has argued that the start of the Viking Age can be pushed back to 700–750, as it was unlikely that the Lindisfarne attack was the first attack, and given archeological evidence that suggests contacts between Scandinavia and the British isles earlier in the century. The earliest raids were most likely small in scale, but expanded in scale during
3354-536: Is the Norwegian trench , which extends parallel to the Norwegian shoreline from Oslo to an area north of Bergen . It is between 20 and 30 kilometres (12 and 19 mi) wide and has a maximum depth of 725 metres (2,379 ft). The Dogger Bank , a vast moraine , or accumulation of unconsolidated glacial debris, rises to a mere 15 to 30 m (50 to 100 ft) below the surface. This feature has produced
3483-518: The Baltic Sea . The largest and most important rivers flowing into the North Sea are the Elbe and the Rhine – Meuse . Around 185 million people live in the catchment area of the rivers discharging into the North Sea encompassing some highly industrialized areas. For the most part, the sea lies on the European continental shelf with a mean depth of 90 metres (300 ft). The only exception
3612-473: The Battle of Heligoland Bight , the Battle of the Dogger Bank , and the Battle of Jutland . World War I also brought the first extensive use of submarine warfare , and a number of submarine actions occurred in the North Sea. The Second World War also saw action in the North Sea, though it was restricted more to aircraft reconnaissance and action by fighter/bomber aircraft, submarines and smaller vessels such as minesweepers and torpedo boats . After
3741-679: The Black Sea and then on to Constantinople . The eastern connections of these " Varangians " brought Byzantine silk , a cowrie shell from the Red Sea, and even coins from Samarkand , to Viking York . In 884, an army of Danish Vikings was defeated at the Battle of Norditi (also called the Battle of Hilgenried Bay) on the Germanic North Sea coast by a Frisian army under Archbishop Rimbert of Bremen-Hamburg, which precipitated
3870-514: The Danelaw ( Danalǫg ), Dublin ( Dyflin ), Normandy , and Kievan Rus' ( Garðaríki ). The Norse homelands were also unified into larger kingdoms during the Viking Age, and the short-lived North Sea Empire included large swathes of Scandinavia and Britain. In 1021, the Vikings achieved the feat of reaching North America—the date of which was not determined until a millennium later. Several things drove this expansion. The Vikings were drawn by
3999-731: The Dnieper and Volga trade routes in eastern Europe, where they were also known as Varangians . They also briefly settled in Newfoundland , becoming the first Europeans to reach North America. The Norse-Gaels , Normans , Rus' people , Faroese , and Icelanders emerged from these Norse colonies. The Vikings founded several kingdoms and earldoms in Europe: the Kingdom of the Isles ( Suðreyjar ), Orkney ( Norðreyjar ), York ( Jórvík ) and
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4128-528: The English Channel was triggered by the earthquake, which in turn caused a tsunami. The tsunami triggered by the 1755 Lisbon earthquake reached Holland, although the waves had lost their destructive power. The largest earthquake ever recorded in the United Kingdom was the 1931 Dogger Bank earthquake , which measured 6.1 on the Richter magnitude scale and caused a small tsunami that flooded parts of
4257-517: The Last Glacial Maximum when the sea began to flood the European continental shelf. In 2006 a bone fragment was found while drilling for oil in the North Sea. Analysis indicated that it was a Plateosaurus from 199 to 216 million years ago. This was the deepest dinosaur fossil ever found and the first find for Norway. Copepods and other zooplankton are plentiful in the North Sea. These tiny organisms are crucial elements of
4386-965: The Latin names Mare Germanicum and Oceanus Germanicus , and these persisted in use until the First World War. Other common names in use for long periods were the Latin terms Mare Frisicum , as well as the English equivalent, "Frisian Sea". The modern names of the sea in the other local languages are: Danish : Vesterhavet , lit. 'West Sea' [ˈvestɐˌhɛˀvð̩] or Nordsøen [ˈnoɐ̯ˌsøˀn̩] , Dutch : Noordzee , Dutch Low Saxon : Noordzee , French : Mer du Nord , West Frisian : Noardsee , German : Nordsee , Low German : Noordsee , North Frisian : Weestsiie , lit. 'West Sea', Swedish : Nordsjön , Bokmål : Nordsjøen [ˈnûːrˌʂøːn] , Nynorsk : Nordsjøen , Scots : North Sea and Scottish Gaelic : An Cuan
4515-595: The Netherlands , Belgium and France . An epeiric sea on the European continental shelf , it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Sea in the north. It is more than 970 kilometres (600 mi) long and 580 kilometres (360 mi) wide, covering 570,000 square kilometres (220,000 sq mi). It hosts key north European shipping lanes and
4644-472: The North Sea flood of 1962 . Though rare, the North Sea has been the site of a number of historically documented tsunamis . The Storegga Slides were a series of underwater landslides, in which a piece of the Norwegian continental shelf slid into the Norwegian Sea. The immense landslips occurred between 8150 BCE and 6000 BCE, and caused a tsunami up to 20 metres (66 ft) high that swept through
4773-1016: The Phare de Walde (Walde Lighthouse, in France, 50°59'37"N, 1°54'53"E) and Leathercoat Point (England, 51°10'01.4"N 1°24'07.8"). northeast of Dover. On the Northwest. From Dunnet Head (58°40'20"N, 3°22'30"W) in Scotland to Tor Ness (58°47'N) in the Island of Hoy , thence through this island to the Kame of Hoy (58°55'N) on to Breck Ness on Mainland (58°58'N) through this island to Costa Head (3°14'W) and Inga Ness (59'17'N) in Westray through Westray, to Bow Head, across to Mull Head (North point of Papa Westray ) and on to Seal Skerry (North point of North Ronaldsay ) and thence to Horse Island (South point of
4902-633: The Seine with near impunity. Near the end of Charlemagne's reign (and throughout the reigns of his sons and grandsons), a string of Norse raids began, culminating in a gradual Scandinavian conquest and settlement of the region now known as Normandy in 911. Frankish King Charles the Simple granted the Duchy of Normandy to Viking warleader Rollo (a chieftain of disputed Norwegian or Danish origins) in order to stave off attacks by other Vikings. Charles gave Rollo
5031-826: The Shetland Islands). On the North. From the North point (Fethaland Point) of the Mainland of the Shetland Islands, across to Graveland Ness (60°39'N) in the Island of Yell , through Yell to Gloup Ness (1°04'W) and across to Spoo Ness (60°45'N) in Unst island, through Unst to Herma Ness (60°51'N), on to the SW point of the Rumblings and to Muckle Flugga ( 60°51′N 0°53′W / 60.850°N 0.883°W / 60.850; -0.883 ) all these being included in
5160-426: The Skagerrak and Kattegat , narrow straits that separate Denmark from Norway and Sweden respectively. In the north it is bordered by the Shetland Islands , and connects with the Norwegian Sea , which is a marginal sea in the Arctic Ocean . The North Sea is more than 970 kilometres (600 mi) long and 580 kilometres (360 mi) wide, with an area of 750,000 square kilometres (290,000 sq mi) and
5289-463: The food chain supporting many species of fish. Over 230 species of fish live in the North Sea. Cod , haddock , whiting , saithe , plaice , sole , mackerel , herring , pouting , sprat , and sandeel are all very common and are fished commercially. Due to the various depths of the North Sea trenches and differences in salinity, temperature, and water movement, some fish such as blue-mouth redfish and rabbitfish reside only in small areas of
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5418-535: The littoral is low and marshy. The east coast and south-east of the North Sea ( Wadden Sea ) have coastlines that are mainly sandy and straight owing to longshore drift , particularly along Belgium and Denmark. The southern coastal areas were originally flood plains and swampy land. In areas especially vulnerable to storm surges, people settled behind elevated levees and on natural areas of high ground such as spits and geestland . As early as 500 BC, people were constructing artificial dwelling hills higher than
5547-622: The 13th century the Hanseatic League , though centred on the Baltic Sea , started to control most of the trade through important members and outposts on the North Sea. The League lost its dominance in the 16th century, as neighbouring states took control of former Hanseatic cities and outposts. Their internal conflict prevented effective cooperation and defence. As the League lost control of its maritime cities, new trade routes emerged that provided Europe with Asian, American, and African goods. The 17th century Dutch Golden Age saw Dutch maritime power at its zenith. Important overseas colonies,
5676-434: The 15th century. According to the Anglo-Saxon Chronicles , Viking raiders struck England in 793 and raided Lindisfarne, the monastery that held Saint Cuthbert 's relics, killing the monks and capturing the valuables. The raid marked the beginning of the "Viking Age of Invasion". Great but sporadic violence continued on England's northern and eastern shores, with raids continuing on a small scale across coastal England. While
5805-426: The 1890s, recognising their artistry, technological skills, and seamanship. The Vikings who invaded western and eastern Europe were mainly pagans from the same area as present-day Denmark, Norway, and Sweden. They also settled in the Faroe Islands , Ireland, Iceland, peripheral Scotland ( Caithness , the Hebrides and the Northern Isles ), Greenland, and Canada. Their North Germanic language , Old Norse , became
5934-405: The 9th century. In the Lindisfarne attack, monks were killed in the abbey, thrown into the sea to drown, or carried away as slaves along with the church treasures, giving rise to the traditional (but unattested) prayer— A furore Normannorum libera nos, Domine , "Free us from the fury of the Northmen, Lord." Three Viking ships had beached in Weymouth Bay four years earlier (although due to
6063-410: The British coast. Shallow epicontinental seas like the current North Sea have since long existed on the European continental shelf . The rifting that formed the northern part of the Atlantic Ocean during the Jurassic and Cretaceous periods, from about 150 million years ago , caused tectonic uplift in the British Isles. Since then, a shallow sea has almost continuously existed between
6192-415: The Clyde", the Brythonic name for Dumbarton Rock , which had become the metonym for their kingdom) was besieged by the Viking kings Amlaíb and Ímar . After four months, its water supply failed, and the fortress fell. The Vikings are recorded to have transported a vast prey of British, Pictish, and English captives back to Ireland. These prisoners may have included the ruling family of Alt Clut including
6321-536: The English kingdoms, being in turmoil, could not stand against the Vikings. In 867, Northumbria became the northern kingdom of the coalescing Danelaw , after its conquest by the Ragnarsson brothers, who installed an Englishman, Ecgberht , as a puppet king. By 870, the "Great Summer Army" arrived in England, led by a Viking leader called Bagsecg and his five earls . Aided by the Great Heathen Army (which had already overrun much of England from its base in Jorvik), Bagsecg's forces, and Halfdan's forces (through an alliance),
6450-496: The Great , won the throne of England in 1016 through conquest. When Cnut the Great died in 1035 he was a king of Denmark, England, Norway, and parts of Sweden. Harold Harefoot became king of England after Cnut's death, and Viking rule of England ceased. The Viking presence declined until 1066, when they lost their final battle with the English at Stamford Bridge . The death in the battle of King Harald Hardrada of Norway ended any hope of reviving Cnut's North Sea Empire , and it
6579-411: The Holy ), a fervent Christianiser who dealt harshly with those suspected of clinging to pagan cult, was killed. Although Óláfr's army lost the battle, Christianity continued to spread, and after his death he became one of the subjects of the three miracle stories given in the Manx Chronicle . In Sweden, the reign of king Olof Skötkonung ( c. 995–1020 ) is considered to be the transition from
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#17327938397516708-501: The Islamic world grew, so did its trade routes, and the wealth which moved along them was pushed further and further north. In Western Europe, proto-urban centres such as those with names ending in wich , the so-called -wich towns of Anglo-Saxon England , began to boom during the prosperous era known as the "Long Eighth Century". The Scandinavians, like many other Europeans, were drawn to these wealthier "urban" centres, which soon became frequent targets of Viking raids. The connection of
6837-407: The Middle Ages and into the modern era. The North Sea was the centre of the Vikings' rise . The Hanseatic League , the Dutch Republic , and the British each sought to gain command of the North Sea and access to the world's markets and resources. As Germany's only outlet to the ocean, the North Sea was strategically important through both world wars. The coast has diverse geology and geography. In
6966-445: The Middle Ages through the 15th century, the northern European coastal ports exported domestic goods, dyes, linen, salt, metal goods and wine. The Scandinavian and Baltic areas shipped grain, fish, naval necessities, and timber. In turn, the North Sea countries imported high-grade cloths, spices, and fruits from the Mediterranean region. Commerce during this era was mainly conducted by maritime trade due to underdeveloped roadways. In
7095-426: The Netherlands. The North Sea Floods of 1953 and 1962 were the impetus for further raising of the dikes as well as the shortening of the coast line so as to present as little surface area as possible to the punishment of the sea and the storms. Currently, 27% of the Netherlands is below sea level protected by dikes, dunes, and beach flats. Coastal management today consists of several levels. The dike slope reduces
7224-683: The North Sea are home to nature reserves including the Ythan Estuary , Fowlsheugh Nature Preserve, and Farne Islands in the UK and the Wadden Sea National Parks in Denmark, Germany and the Netherlands. These locations provide breeding habitat for dozens of bird species. Tens of millions of birds make use of the North Sea for breeding, feeding, or migratory stopovers every year. Populations of black-legged kittiwakes , Atlantic puffins , northern gannets , northern fulmars , and species of petrels , seaducks , loons (divers), cormorants , gulls , auks , and terns , and many other seabirds make these coasts popular for birdwatching . The North Sea
7353-516: The North Sea area; thence up the meridian of 0°53' West to the parallel of 61°00' North and eastward along this parallel to the coast of Norway, the whole of Viking Bank is thus included in the North Sea. On the East. The Western limit of the Skagerrak [A line joining Hanstholm ( 57°07′N 8°36′E / 57.117°N 8.600°E / 57.117; 8.600 ) and the Naze ( Lindesnes , 58°N 7°E / 58°N 7°E / 58; 7 )]. The average temperature
7482-402: The North Sea during the Migration Period . They made successive invasions of the island from what is now the Netherlands, Denmark, and Germany. The Viking Age began in 793 with the attack on Lindisfarne ; for the next quarter-millennium, the Vikings ruled the North Sea. In their superior longships , they raided, traded, and established colonies and outposts along the coasts of the sea. From
7611-554: The North Sea include species of wrack , among them bladder wrack , knotted wrack , and serrated wrack. Algae , macroalgal, and kelp , such as oarweed and laminaria hyperboria, and species of maerl are found as well. Eelgrass , formerly common in the entirety of the Wadden Sea, was nearly wiped out in the 20th century by a disease. Similarly, sea grass used to coat huge tracts of ocean floor, but have been damaged by trawling and dredging have diminished its habitat and prevented its return. Invasive Japanese seaweed has spread along
7740-445: The North Sea to Great Britain and Scandinavia and reliance by some prehistoric cultures on fishing, whaling, and seaborne trade on the North Sea. The Romans established organised ports in Britain, which increased shipping and began sustained trade the diffusion of cultures and technologies from across or along the North Sea to Great Britain and Scandinavia and reliance by some prehistoric cultures on fishing, whaling, and seaborne trade on
7869-416: The North Sea until the 20th century, when numbers declined due to overfishing . Other factors like the introduction of non-indigenous species , industrial and agricultural pollution , trawling and dredging , human-induced eutrophication , construction on coastal breeding and feeding grounds, sand and gravel extraction, offshore construction , and heavy shipping traffic have also contributed to
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#17327938397517998-420: The North Sea, having the greatest effect on Scotland and the Faeroe Islands . The Dover Straits earthquake of 1580 is among the first recorded earthquakes in the North Sea measuring between 5.6 and 5.9 on the Richter scale. This event caused extensive damage in Calais both through its tremors and possibly triggered a tsunami , though this has never been confirmed. The theory is a vast underwater landslide in
8127-399: The North Sea. Crustaceans are also commonly found throughout the sea. Norway lobster , deep-water prawns , and brown shrimp are all commercially fished, but other species of lobster , shrimp , oyster , mussels and clams all live in the North Sea. Recently non-indigenous species have become established including the Pacific oyster and Atlantic jackknife clam . The coasts of
8256-399: The North Sea. The Romans established organised ports in Britain, which increased shipping and began sustained trade and many Scandinavian tribes participated in raids and wars against the Romans and Roman coinage and manufacturing were important trade goods. When the Romans abandoned Britain in 410, the Germanic Angles , Frisians , Saxons , and Jutes began the next great migration across
8385-448: The North Sea. The wave continues to travel northward in the Atlantic Ocean, and once past the northern tip of Great Britain, the Kelvin wave turns east and south and once again enters the North Sea. The eastern and western coasts of the North Sea are jagged, formed by glaciers during the ice ages . The coastlines along the southernmost part are covered with the remains of deposited glacial sediment. The Norwegian mountains plunge into
8514-405: The Norwegian king Harald III ( Haraldr Harðráði ), who was defeated by Saxon King Harold Godwinson in 1066 at the Battle of Stamford Bridge ; in Ireland, the capture of Dublin by Strongbow and his Hiberno-Norman forces in 1171; and 1263 in Scotland by the defeat of King Hákon Hákonarson at the Battle of Largs by troops loyal to Alexander III . Godwinson was subsequently defeated within
8643-570: The Norwegian zone, and from several of the UK's oil fields, such as Fulmar and Judy (see table). A tie-in point for UK fields is located about 50 kilometres (31 mi) from Ekofisk. It has a landfall at Teesside Refinery in England . The length of pipeline is 354 kilometres (220 mi) and it has diameter of 34 inches (860 mm). The pipeline is owned by Norpipe Oil AS, a consortium which includes ConocoPhillips Skandinavia AS (35.05%), TotalFinaElf Exploration Norge AS (34.93%), Statoil (18.5%), Eni Norge AS (6.52%), and SDFI (5%). It
8772-438: The Orkney Islands through the mid-16th century, as both Sable Island and Orkney Islands lay within their normal range. Grey whales also resided in the North Sea but were driven to extinction in the Atlantic in the 17th century Other species have dramatically declined in population, though they are still found. North Atlantic right whales , sturgeon , shad , rays , skates , salmon , and other species were common in
8901-399: The Oïl languages along with French, Picard and Walloon), and their Norman culture, into England in 1066. With the Norman Conquest , they became the ruling aristocracy of Anglo–Saxon England . The clinker -built longships used by the Scandinavians were uniquely suited to both deep and shallow waters. They extended the reach of Norse raiders, traders, and settlers along coastlines and along
9030-471: The Pictish aristocracy in battle. The sophisticated kingdom that had been built fell apart, as did the Pictish leadership, which had been stable for more than 100 years since the time of Óengus mac Fergusa (The accession of Cináed mac Ailpín as king of both Picts and Scots can be attributed to the aftermath of this event). In 870, the Britons of the Old North around the Firth of Clyde came under Viking attack as well. The fortress atop Alt Clut ("Rock of
9159-468: The Scandinavians to larger and richer trade networks lured the Vikings into Western Europe, and soon the rest of Europe and parts of the Middle East. In England, hoards of Viking silver, such as the Cuerdale Hoard and the Vale of York Hoard , offer insight into this phenomenon. Barrett rejects this model, arguing that the earliest recorded Viking raids were in Western Norway and northern Britain, which were not highly economically integrated areas. He proposes
9288-797: The Scottish seas and islands were completely relinquished after another 200 years. By the mid-9th century, the Norsemen had settled in Shetland, Orkney (the Nordreys- Norðreyjar ), the Hebrides and Isle of Man, (the Sudreys- Suðreyjar —this survives in the Diocese of Sodor and Man ) and parts of mainland Scotland. The Norse settlers were to some extent integrating with the local Gaelic population (see Norse-Gaels ) in
9417-705: The Thames estuary. In 864, they reverted to Thanet for their winter encampment. The following year, the Great Heathen Army , led by brothers Ivar the Boneless , Halfdan and Ubba , and also by another Viking Guthrum , arrived in East Anglia. They proceeded to cross England into Northumbria and captured York, establishing a Viking community in Jorvik , where some settled as farmers and craftsmen. Most of
9546-575: The Viking Age to the Middle Ages, because he was the first Christian king of the Swedes, and he is associated with a growing influence of the church in what is today southwestern and central Sweden. Norse beliefs persisted until the 12th century; Olof was the last king in Scandinavia to adopt Christianity. The end of the Viking Age is traditionally marked in England by the failed invasion attempted by
9675-554: The Viking attacks may have been in response to the spread of Christianity among pagan peoples. Because of the penetration of Christianity in Scandinavia , serious conflict divided Norway for almost a century. The first of two main components to the political model is the external "pull" factor, which suggests that the weak political bodies of Britain and Western Europe made for an attractive target for Viking raiders. The reasons for these weaknesses vary, but generally can be simplified into decentralised polities, or religious sites. As
9804-679: The Viking frontier and take York. A new wave of Vikings appeared in England in 947, when Eric Bloodaxe captured York. In 1003, the Danish King Sweyn Forkbeard started a series of raids against England to avenge the St. Brice's Day massacre of England's Danish inhabitants, culminating in a full-scale invasion that led to Sweyn being crowned king of England in 1013. Sweyn was also king of Denmark and parts of Norway at this time. The throne of England passed to Edmund Ironside of Wessex after Sweyn's death in 1014. Sweyn's son, Cnut
9933-459: The Vikings off. However, after 830 CE , the Vikings had considerable success against England, the Carolingian Empire, and other parts of Western Europe. After 830, the Vikings exploited disunity within the Carolingian Empire, as well as pitting the English kingdoms against each other. The Kingdom of the Franks under Charlemagne was particularly devastated by these raiders, who could sail up
10062-571: The Vikings to sail farther and longer to begin with. Information about the Viking Age is drawn largely from primary sources written by those the Vikings encountered, as well as archaeology, supplemented with secondary sources such as the Icelandic Sagas . In England, the Viking attack of 8 June 793 that destroyed the abbey on Lindisfarne , a centre of learning on an island off the northeast coast of England in Northumberland ,
10191-512: The air, and whirlwinds, and fiery dragons flying across the firmament. These tremendous tokens were soon followed by a great famine: and not long after, on the sixth day before the ides of January in the same year, the harrowing inroads of heathen men made lamentable havoc in the church of God in Holy-island (Lindisfarne) , by rapine and slaughter. In 794, according to the Annals of Ulster ,
10320-695: The battles of Glenmama (999 CE ) and Clontarf (1014 CE ). After the battle of Clontarf, the Dublin Vikings could no longer "single-handedly threaten the power of the most powerful kings of Ireland". Brian's rise to power and conflict with the Vikings is chronicled in Cogad Gáedel re Gallaib ("The War of the Irish with the Foreigners"). While few records are known, the Vikings are thought to have led their first raids in Scotland on
10449-581: The beginning of this age was the result of some combination of the aforementioned hypotheses. The Viking colonisation of islands in the North Atlantic has in part been attributed to a period of favourable climate (the Medieval Climactic Optimum), as the weather was relatively stable and predictable, with calm seas. Sea ice was rare, harvests were typically strong, and fishing conditions were good. The earliest date given for
10578-518: The cause of the Viking invasions; the will to explore likely played a major role. At the time, England, Wales, and Ireland were vulnerable to attack, being divided into many different warring kingdoms in a state of internal disarray, while the Franks were well defended. Overpopulation, especially near the Scandes , was a possible reason, although some disagree with this theory. Technological advances like
10707-455: The coast and overwintering in Ireland. The first were at Dublin and Linn Duachaill . Their attacks became bigger and reached further inland, striking larger monastic settlements such as Armagh , Clonmacnoise , Glendalough , Kells , and Kildare , and also plundering the ancient tombs of Brú na Bóinne . Viking chief Thorgest is said to have raided the whole midlands of Ireland until he
10836-611: The coasts of the Netherlands, Belgium, Germany, and Denmark and low-lying areas of eastern England particularly around The Wash and Fens . Storm surges are caused by changes in barometric pressure combined with strong wind created wave action . The first recorded storm tide flood was the Julianenflut , on 17 February 1164. In its wake, the Jadebusen , (a bay on the coast of Germany), began to form. A storm tide in 1228
10965-422: The combined Viking forces raided much of England until 871, when they planned an invasion of Wessex. On 8 January 871, Bagsecg was killed at the Battle of Ashdown along with his earls. As a result, many of the Vikings returned to northern England, where Jorvic had become the centre of the Viking kingdom, but Alfred of Wessex managed to keep them out of his country. Alfred and his successors continued to drive back
11094-496: The coming of Vikings to England is 789 during the reign of King Beorhtric of Wessex . According to the Anglo-Saxon Chronicle three Norwegian boats from Hordaland (Old Norse: Hǫrðalandi ) landed at the Isle of Portland off the coast of Dorset. They apparently were mistaken for merchants by a royal official, Beaduhard, a king's reeve who attempted to force them to come to the king's manor, whereupon they killed
11223-414: The complete and permanent withdrawal of the Vikings from East Frisia . In the 10th and 11th centuries, Saxons and Slavs began to use trained mobile cavalry successfully against Viking foot soldiers, making it hard for Viking invaders to fight inland. In Scandinavia, the Viking Age is considered by some scholars to have ended with the establishment of royal authority and the establishment of Christianity as
11352-586: The decline. For example, a resident orca pod was lost in the 1960s, presumably due to the peak in PCB pollution in this time period. The OSPAR commission manages the OSPAR convention to counteract the harmful effects of human activity on wildlife in the North Sea, preserve endangered species , and provide environmental protection. All North Sea border states are signatories of the MARPOL 73/78 Accords, which preserve
11481-536: The dominant religion. Scholars have proposed different end dates for the Viking Age, but many argue it ended in the 11th century. The year 1000 is sometimes used, as that was the year in which Iceland converted to Christianity, marking the conversion of all of Scandinavia to Christianity. The death of Harthacnut, the Danish King of England, in 1042 has also been used as an end date. History does not often allow such clear-cut separation between arbitrary "ages", and it
11610-555: The energy of the incoming sea, so that the dike itself does not receive the full impact. Dikes that lie directly on the sea are especially reinforced. The dikes have, over the years, been repeatedly raised, sometimes up to 9 metres (30 ft) and have been made flatter to better reduce wave erosion. Where the dunes are sufficient to protect the land behind them from the sea, these dunes are planted with beach grass ( Ammophila arenaria ) to protect them from erosion by wind, water, and foot traffic. Storm surges threaten, in particular,
11739-572: The finest fishing location of the North Sea. The Long Forties and the Broad Fourteens are large areas with roughly uniform depth in fathoms (forty fathoms and fourteen fathoms or 73 and 26 m or 240 and 85 ft deep, respectively). These great banks and others make the North Sea particularly hazardous to navigate, which has been alleviated by the implementation of satellite navigation systems . The Devil's Hole lies 320 kilometres (200 mi) east of Dundee , Scotland. The feature
11868-492: The formerly enemy peoples that comprised what would become present-day Scotland. Over the subsequent 300 years, this Viking upheaval and pressure led to the unification of the previously contending Gaelic, Pictish, British, and English kingdoms, first into the Kingdom of Alba , and finally into the greater Kingdom of Scotland . The Viking Age in Scotland came to an end after another 100 years. The last vestiges of Norse power in
11997-429: The general European population and settlement expansion at the end of the first millennium, he dismisses 'population pressure' as a realistic cause of the Viking Age. Bagge alludes to the evidence of demographic growth at the time, manifested in an increase of new settlements, but he declares that a warlike people do not require population pressure to resort to plundering abroad. He grants that although population increase
12126-474: The greater Ekofisk decommissioning. The specification of the booster station was as follows. The following fields and installations export oil into the Norpipe pipeline. The annual oil production from 1998 (in 1000 tonnes) was: The total oil throughput of the terminal up to the end of 2021 was 104.585 million tonnes. The 440-kilometre (270 mi) long Norpipe natural gas pipeline runs from Ekofisk to
12255-481: The growth of wealthy towns and monasteries overseas and weak kingdoms. They may also have been pushed to leave their homeland by overpopulation, lack of good farmland, and political strife arising from the unification of Norway . The aggressive expansion of the Carolingian Empire and forced conversion of the neighbouring Saxons to Christianity may also have been a factor. Sailing innovations had allowed
12384-531: The highest variability where there is fresh water inflow, such as at the Rhine and Elbe estuaries, the Baltic Sea exit and along the coast of Norway. The main pattern to the flow of water in the North Sea is an anti-clockwise rotation along the edges. The North Sea is an arm of the Atlantic Ocean receiving the majority of ocean current from the northwest opening, and a lesser portion of warm current from
12513-669: The holy island of Iona in 794, the year following the raid on the other holy island of Lindisfarne , Northumbria. In 839, a large Norse fleet invaded via the River Tay and River Earn , both of which were highly navigable, and reached into the heart of the Pictish kingdom of Fortriu . They defeated Eogán mac Óengusa , king of the Picts, his brother Bran, and the king of the Scots of Dál Riata , Áed mac Boanta , along with many members of
12642-401: The initial raiding groups were small, a great amount of planning is believed to have been involved. The Vikings raided during the winter of 840–841, rather than the usual summer, having waited on an island off Ireland. In 850, the Vikings overwintered for the first time in England, on the island of Thanet , Kent . In 854, a raiding party overwintered a second time, at the Isle of Sheppey in
12771-487: The king Arthgal ap Dyfnwal , who was slain the following year under uncertain circumstances. The fall of Alt Clut marked a watershed in the history of the realm. Afterwards, the capital of the restructured kingdom was relocated about 12 miles (20 km) up the River Clyde to the vicinity of Govan and Partick (within present-day Glasgow ), and became known as the Kingdom of Strathclyde , which persisted as
12900-489: The kings and dynasties that began to emerge. As a result, many of these chiefs sought refuge elsewhere, and began harrying the coasts of the British Isles and Western Europe. Anders Winroth argues that purposeful choices by warlords "propelled the Viking Age movement of people from Scandinavia." These models constitute much of what is known about the motivations for and the causes of the Viking Age. In all likelihood,
13029-491: The last of which took place in 1086. In 1152, Eystein II of Norway led a plundering raid down the east coast of Britain. In 795, small bands of Vikings began plundering monastic settlements along the coast of Gaelic Ireland . The Annals of Ulster state that in 821 the Vikings plundered Howth and "carried off a great number of women into captivity". From 840 the Vikings began building fortified encampments, longphorts , on
13158-618: The major river valleys of north-western Europe. Rurik also expanded to the east, and in 859 became ruler either by conquest or invitation by local people of the city of Novgorod (which means "new city") on the Volkhov River . His successors moved further, founding the early East Slavic state of Kievan Rus' with the capital in Kiev . This persisted until 1240, when the Mongols invaded Kievan Rus' . Other Norse people continued south to
13287-489: The marine environment by preventing pollution from ships. Germany, Denmark, and the Netherlands also have a trilateral agreement for the protection of the Wadden Sea , or mudflats , which run along the coasts of the three countries on the southern edge of the North Sea. The North Sea has had various names throughout history. One of the earliest recorded names was Septentrionalis Oceanus , or "Northern Ocean", which
13416-523: The north, and they never managed to establish permanent settlements in that region. The Vikings were driven from Dublin in 902. They returned in 914, now led by the Uí Ímair (House of Ivar). During the next eight years the Vikings won decisive battles against the Irish, regained control of Dublin, and founded settlements at Waterford , Wexford , Cork , and Limerick , which became Ireland's first large towns. They were important trading hubs, and Viking Dublin
13545-679: The north, deep fjords and sheer cliffs mark much of its Norwegian and Scottish coastlines respectively, whereas in the south, the coast consists mainly of sandy beaches, estuaries of long rivers and wide mudflats . Due to the dense population, heavy industrialisation , and intense use of the sea and the area surrounding it, various environmental issues affect the sea's ecosystems. Adverse environmental issues – commonly including overfishing , industrial and agricultural runoff , dredging , and dumping, among others – have led to several efforts to prevent degradation and to safeguard long-term economic benefits. The North Sea
13674-518: The people of East Anglia wherein they are described as "wolves among sheep". The first challenges to the many negative depictions of Vikings in Britain emerged in the 17th century. Pioneering scholarly works on the Viking Age reached only a small readership there, while linguists traced the Viking Age origins of rural idioms and proverbs. New dictionaries and grammars of the Old Icelandic language appeared, enabling more Victorian scholars to read
13803-629: The period. The Scandinavians of the Viking Age are often referred to as Vikings as well as Norsemen , although few of them were Vikings in the sense of being engaged in piracy. Voyaging by sea from their homelands in Denmark , Norway , and Sweden , the Norse people settled in the British Isles , Ireland , the Faroe Islands , Iceland , Greenland , Normandy , and the Baltic coast and along
13932-454: The pirates looked further and further beyond the borders of the Baltic , and eventually into all of Europe. Historian Anders Winroth has also challenged the "overpopulation" thesis, arguing that scholars are "simply repeating an ancient cliché that has no basis in fact." The economic model states that the Viking Age was the result of growing urbanism and trade throughout mainland Europe. As
14061-561: The precursor to present-day Scandinavian languages. By 801, a strong central authority appears to have been established in Jutland , and the Danes were beginning to look beyond their own territory for land, trade, and plunder. In Norway, mountainous terrain and fjords formed strong natural boundaries. Communities remained independent of each other, unlike the situation in lowland Denmark. By 800, some 30 small kingdoms existed in Norway. The sea
14190-500: The prevailing flood levels. It was only around the beginning of the High Middle Ages , in 1200 AD, that inhabitants began to connect single ring dikes into a dike line along the entire coast, thereby turning amphibious regions between the land and the sea into permanent solid ground. The modern form of the dikes supplemented by overflow and lateral diversion channels, began to appear in the 17th and 18th centuries, built in
14319-668: The primary texts of the Icelandic Sagas. In Scandinavia, the 17th-century Danish scholars Thomas Bartholin and Ole Worm and Swedish scholar Olaus Rudbeck were the first to use runic inscriptions and Icelandic Sagas as primary historical sources. During the Enlightenment and Nordic Renaissance, historians such as the Icelandic-Norwegian Thormodus Torfæus , Danish-Norwegian Ludvig Holberg , and Swedish Olof von Dalin developed
14448-639: The reeve and his men. The beginning of the Viking Age in the British Isles is often set at 793. It was recorded in the Anglo–Saxon Chronicle that the Northmen raided the important island monastery of Lindisfarne (the generally accepted date is actually 8 June, not January ): A.D. 793. This year came dreadful fore-warnings over the land of the Northumbrians, terrifying the people most woefully: these were immense sheets of light rushing through
14577-469: The sea creating deep fjords and archipelagos . South of Stavanger, the coast softens, the islands become fewer. The eastern Scottish coast is similar, though less severe than Norway. From north east of England , the cliffs become lower and are composed of less resistant moraine , which erodes more easily, so that the coasts have more rounded contours. In the Netherlands, Belgium and in East Anglia
14706-413: The shores of the sea clogging harbours and inlets and has become a nuisance. Due to the heavy human populations and high level of industrialization along its shores, the wildlife of the North Sea has suffered from pollution, overhunting, and overfishing. Flamingos and pelicans were once found along the southern shores of the North Sea, but became extinct over the second millennium. Walruses frequented
14835-471: The smaller opening at the English Channel. These tidal currents leave along the Norwegian coast. Surface and deep water currents may move in different directions. Low salinity surface coastal waters move offshore, and deeper, denser high salinity waters move inshore. The North Sea located on the continental shelf has different waves from those in deep ocean water. The wave speeds are diminished and
14964-479: The title of duke. In return, Rollo swore fealty to Charles, converted to Christianity, and undertook to defend the northern region of France against the incursions of other Viking groups. Several generations later, the Norman descendants of these Viking settlers not only identified themselves as Norman, but also carried the Norman language (either a French dialect or a Romance language which can be classified as one of
15093-825: The uplands of the Fennoscandian Shield and the British Isles. This precursor of the current North Sea has grown and shrunk with the rise and fall of the eustatic sea level during geologic time. Sometimes it was connected with other shallow seas, such as the sea above the Paris Basin to the south-west, the Paratethys Sea to the south-east, or the Tethys Ocean to the south. During the Late Cretaceous, about 85 million years ago , all of modern mainland Europe except for Scandinavia
15222-491: The use of iron and a shortage of women due to selective female infanticide also likely had an impact. Tensions caused by Frankish expansion to the south of Scandinavia, and their subsequent attacks upon the Viking peoples, may have also played a role in Viking pillaging. Harald I of Norway ("Harald Fairhair") had united Norway around this time and displaced many peoples. As a result, these people sought for new bases to launch counter-raids against Harald. Debate among scholars
15351-568: The war on the side of Japan. During the First World War , Great Britain's Grand Fleet and Germany's Kaiserliche Marine faced each other in the North Sea, which became the main theatre of the war for surface action. Britain's larger fleet and North Sea Mine Barrage were able to establish an effective blockade for most of the war, which restricted the Central Powers ' access to many crucial resources. Major battles included
15480-589: The war, hundreds of thousands of tons of chemical weapons were disposed of by being dumped in the North Sea. Viking Age Chronological history The Viking Age (about 800–1050 CE ) was the period during the Middle Ages when Norsemen known as Vikings undertook large-scale raiding, colonising, conquest, and trading throughout Europe and reached North America. The Viking Age applies not only to their homeland of Scandinavia but also to any place significantly settled by Scandinavians during
15609-406: The wave amplitudes are increased. In the North Sea there are two amphidromic systems and a third incomplete amphidromic system. In the North Sea the average tide difference in wave amplitude is between zero and eight metres (26 ft). The Kelvin tide of the Atlantic Ocean is a semidiurnal wave that travels northward. Some of the energy from this wave travels through the English Channel into
15738-509: Was "a patron of the arts, a benefactor of the church, and an economic innovator" who established Ireland's first mint , in Dublin. In 980 CE , Máel Sechnaill Mór defeated the Dublin Vikings and forced them into submission. Over the following thirty years, Brian Boru subdued the Viking territories and made himself High King of Ireland . The Dublin Vikings, together with Leinster , twice rebelled against him, but they were defeated in
15867-474: Was a factor in this expansion, it was not the incentive for such expeditions. According to Ferguson, the proliferation of the use of iron in Scandinavia at the time increased agricultural yields, allowing for demographic growth that strained the limited capacity of the land. As a result, many Scandinavians found themselves with no property and no status. To remedy this, these landless men took to piracy to obtain material wealth. The population continued to grow, and
15996-595: Was a scattering of islands. By the Early Oligocene , 34 to 28 million years ago , the emergence of Western and Central Europe had almost completely separated the North Sea from the Tethys Ocean, which gradually shrank to become the Mediterranean as Southern Europe and South West Asia became dry land. The North Sea was cut off from the English Channel by a narrow land bridge until that
16125-566: Was breached by at least two catastrophic floods between 450,000 and 180,000 years ago. Since the start of the Quaternary period about 2.6 million years ago , the eustatic sea level has fallen during each glacial period and then risen again. Every time the ice sheet reached its greatest extent, the North Sea became almost completely dry, the dry landmass being known as Doggerland , whose northern regions were themselves known to have been glaciated. The present-day coastline formed after
16254-632: Was cited by Pliny . He also noted that the Cimbri called it Morimarusa – "Dead Sea". The name "North Sea" probably came into English, however, via the Dutch Noordzee , who named it thus either in contrast with the Zuiderzee ("South Sea"), located south of Frisia , or because the sea is generally to the north of the Netherlands. Before the adoption of "North Sea", the names used in English were "German Sea" or "German Ocean", referred to as
16383-571: Was killed by Máel Sechnaill I in 845. In 853, Viking leader Amlaíb (Olaf) became the first king of Dublin . He ruled along with his brothers Ímar (possibly Ivar the Boneless ) and Auisle . Over the following decades, there was regular warfare between the Vikings and the Irish, and between two groups of Vikings: the Dubgaill and Finngaill (dark and fair foreigners). The Vikings also briefly allied with various Irish kings against their rivals. In 866, Áed Findliath burnt all Viking longphorts in
16512-470: Was the biggest slave port in western Europe. These Viking territories became part of the patchwork of kingdoms in Ireland. Vikings intermarried with the Irish and adopted elements of Irish culture, becoming the Norse-Gaels . Some Viking kings of Dublin also ruled the kingdom of the Isles and York ; such as Sitric Cáech , Gofraid ua Ímair , Olaf Guthfrithson , and Olaf Cuaran . Sigtrygg Silkbeard
16641-483: Was the easiest way of communication between the Norwegian kingdoms and the outside world. In the eighth century, Scandinavians began to build ships of war and send them on raiding expeditions which started the Viking Age. The North Sea rovers were traders, colonisers, explorers, and plunderers who were notorious in England, Scotland, Ireland, Wales and other places in Europe for being brutal. Many theories are posited for
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