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68-682: The river leaves the Old River Lea below Kings Weir to flow through an aqueduct under the River Lee Navigation at Aqueduct Lock . It is joined by Turnford Brook TL3624703866 at Turnford before meandering in a southerly direction past various lakes including the North Metropolitan and Cheshunt Lake and parallel with the West Anglia Main Line railway line. The river forms a boundary with

136-523: A distinctively bow-shaped, three-arched, bridge to be built over the River Lea ( The like of which had not been seen before ), at Bow, the first bridge over the lower Lea. The lower Lea was at that time a wide, tidal and unchannelled river, so the construction of the bridge allowed a far greater degree of social and economic integration between Essex on one side and Middlesex (including the City of London) on

204-615: A neolithic henge at Leagrave Common in Luton , Bedfordshire , although just downstream the river is joined by Houghton Brook , a stream that starts 2 miles (3 km) further west in Houghton Regis . After passing through Luton, the young river passes through the Luton Hoo estate and, six miles from its source, enters Hertfordshire . The river then flows east-south-east through Harpenden , Wheathampstead – once capital of

272-629: A branch of the Indo-European language family , descended from Proto-Celtic . The term "Celtic" was first used to describe this language group by Edward Lhuyd in 1707, following Paul-Yves Pezron , who made the explicit link between the Celts described by classical writers and the Welsh and Breton languages. During the first millennium BC, Celtic languages were spoken across much of Europe and central Anatolia . Today, they are restricted to

340-466: A common Italo-Celtic subfamily. This hypothesis fell somewhat out of favour after reexamination by American linguist Calvert Watkins in 1966. Irrespectively, some scholars such as Ringe, Warnow and Taylor and many others have argued in favour of an Italo-Celtic grouping in 21st century theses. Although there are many differences between the individual Celtic languages, they do show many family resemblances. Examples: The lexical similarity between

408-761: A correspondent to the Gentleman's Magazine in 1823, in which he claimed to have heard from a woman who was a child in the reign of Charles II (r. 1660–1685) and had the lyrics: Celtic languages Pontic Steppe Caucasus East Asia Eastern Europe Northern Europe Pontic Steppe Northern/Eastern Steppe Europe South Asia Steppe Europe Caucasus India Indo-Aryans Iranians East Asia Europe East Asia Europe Indo-Aryan Iranian Indo-Aryan Iranian Others European The Celtic languages ( / ˈ k ɛ l t ɪ k / KEL -tik ) are

476-481: A new or altered constituency that spans either river, viewing such a construct as artificial and not reflective of local communities or identities. They have compromised on this further south, on the lower Lea, where the quality and quantity of cross-river links is much greater, and the communities on either side better integrated as a result. The source of the Lea is usually said to be at Well Head inside Waulud's Bank ,

544-472: A number of place-names, including Leagrave , the suburb of Luton where the source of the river is located, and of Luton and Leyton : both mean "farmstead on the River Lea" . The spelling Lea predominates west (upstream) of Hertford , but both spellings ( Lea and Lee ) are used from Hertford to the River Thames . The Lee Navigation was established by Acts of Parliament and only that spelling

612-485: A rich literary tradition . The earliest specimens of written Celtic are Lepontic inscriptions from the 6th century BC in the Alps. Early Continental inscriptions used Italic and Paleohispanic scripts. Between the 4th and 8th centuries, Irish and Pictish were occasionally written in an original script, Ogham , but Latin script came to be used for all Celtic languages. Welsh has had a continuous literary tradition from

680-685: A river in England is a stub . You can help Misplaced Pages by expanding it . River Lea The River Lea ( / ˈ l iː / LEE ) is in the East of England and Greater London . It originates in Bedfordshire , in the Chiltern Hills , and flows southeast through Hertfordshire , along the Essex border and into Greater London , to meet the River Thames at Bow Creek . It is one of

748-781: A shipyard which straddled either side of the Lea at its confluence with the Thames. The 2012 Olympics was focused in the Queen Elizabeth Olympic Park on the banks of the Lea, and its main Stadium, on an island between two branches of the river, is now home to West Ham United. The Lee Valley White Water Centre in Hertfordshire is another sporting legacy of the games. Various versions of the nursery rhyme London Bridge Is Falling Down make reference to Bow Bridge. The oldest known version could be that recalled by

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816-737: Is Cockney rhyming slang for tea. The line of the Lea, and its major tributary, the Stort, has long been used as a political boundary. In the Iron Age the Lea and Stort valleys formed a hotly contested frontier zone between the Catuvellauni to the west and the eastern Trinovantes . The two rivers are assumed to have been the boundary between the core territory of the Kingdom of the East Saxons and its Middle Saxon Province . The whole of

884-530: Is almost certainly an independent branch on the Celtic genealogical tree, one that became separated from the others very early." The Breton language is Brittonic, not Gaulish, though there may be some input from the latter, having been introduced from Southwestern regions of Britain in the post-Roman era and having evolved into Breton. In the P/Q classification schema, the first language to split off from Proto-Celtic

952-528: Is also the derivation of a name for a deity, so the meaning may be 'bright river' or 'river dedicated to the god Lugus '. A simpler derivation may well be the Brythonic word cognate with the modern Welsh "Li" pronounced "Lea" which means a flow or a current. Much of the middle Lea were historically known as 'Mereditch', the first element deriving from the Old English ‘gemaera’, meaning boundary. This

1020-574: Is an official language of Ireland and of the European Union . Welsh is the only Celtic language not classified as endangered by UNESCO . The Cornish and Manx languages became extinct in modern times but have been revived. Each now has several hundred second-language speakers. Irish, Manx and Scottish Gaelic form the Goidelic languages , while Welsh, Cornish and Breton are Brittonic . All of these are Insular Celtic languages , since Breton,

1088-680: Is derived). The River Lea flows through the old brewing and malting centre of Ware , and consequently transport by water was for many years a significant industry based there. Barley was transported into Ware, and malt out via the river, in particular to London. Bargemen born in Ware were given the "freedom of the River Thames" — avoiding the requirement of paying lock dues — as a result of their transport of fresh water and food to London during The Great Plague of 1665–66. A local legend says that dead bodies were brought out of London at that time via

1156-610: Is still quite contested, and the main argument for Insular Celtic is connected with the development of verbal morphology and the syntax in Irish and British Celtic, which Schumacher regards as convincing, while he considers the P-Celtic/Q-Celtic division unimportant and treats Gallo-Brittonic as an outdated theory. Stifter affirms that the Gallo-Brittonic view is "out of favour" in the scholarly community as of 2008 and

1224-541: Is used in this context. The Lee Valley Regional Park Authority also uses this spelling for leisure facilities. However, the spelling Lea is used for road names, locations and other infrastructure in the capital, such as Leamouth , Lea Bridge , the Lea Valley Walk and the Lea Valley lines (railway). This spelling is also used in geology, archaeology, etc. to refer to the Lea Valley . The term River Lea

1292-472: The A1055 road . The river flows mostly hidden in a deep channel. Shallow and prone to pollution, it is not known as a fishery. It is however a valuable spawning/nursery area for fish. 51°41′10″N 0°01′04″W  /  51.686°N 0.0179°W  / 51.686; -0.0179 This Hertfordshire location article is a stub . You can help Misplaced Pages by expanding it . This article related to

1360-513: The Battle of Bow Bridge , the Royalists headed for Colchester and were besieged there . During WWI, parts of London on either side of the Lea were badly hit by German Army and Navy airship raids. It is believed the crews mistook the extensive reservoir chain for the Thames and released their bombs on what they took to be central London. The ecological, landscape and recreational importance of

1428-480: The Catuvellauni tribe – through the narrow green gap between the new towns of Hatfield and Welwyn Garden City , and on to the county town of Hertford . At Hertford the shallow river turns briefly north before turning to head due south, and here the river and its surrounding areas change significantly. Around Hertford, the Lea is joined by a number of major tributaries: the Mimram , Beane , Rib , Ash , and then

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1496-620: The Congreve Rocket Factory on the site of Stratford Langthorne Abbey . Improvements were made to the river from 1424, with tolls being levied to compensate the landowners, and in 1571, there were riots after the extension of the River was promoted in a private bill presented to the House of Commons . By 1577, the first lock was established at Waltham Abbey and the river began to be actively managed for navigation. The New River

1564-588: The Middle Lea . During the Middle Ages , Temple Mills , Abbey Mills , Old Ford and Bow were the sites of water mills (mainly in ecclesiastic ownership) that supplied flour to the bakers of Stratforde-atte-Bow, and hence bread to the City. It was the channels created for these mills that caused the Bow Back Rivers to be cut through the former Roman stone causeway at Stratford (from which the name

1632-475: The Prescott Channel to maintain water levels on the Lea, within the park at a depth of 2 metres (7 ft). This allowed access to the site by 350–tonne barges with the aim that at least half of the material required for construction could be delivered or removed by water. In January 2024, the River Lea burst its banks as Hackney Wick residents tell of 'knee-high' flood water. Millfields Park on

1700-544: The Queen Elizabeth Olympic Park . In that park, and just to the south of it, the river's course splits, running almost entirely in man-made channels, the Bow Back Rivers . These channels were once much more numerous and originally created to power water mills including, at the southern end, the restored tidal mill called Three Mills . The area around the Bow Back Rivers subsequently became a thriving industrial zone. Around Bow Creek , major industry prevailed, including

1768-541: The Stort . This extra volume of water has created a broad flood plain with sometimes steep hills on either side. The river passes through this valley in several channels, which are a result of both human intervention and natural causes. The increased flow made the river navigable from Hertford, a situation improved by the creation of the Lee Navigation , a deep canal which begins at Hertford Castle Weir . The Stort,

1836-534: The Thames Ironworks , Bromley-by-Bow Gasworks and West Ham Power Station . In the 1960s and 1970s, changing economic conditions led to a steep decline and deindustrialisation along this section of the Lea. The river was historically tidal as far north as Hackney Wick , but now the tide is held back by the Bow Locks between Bromley-by-Bow and West Ham. Although watercraft can follow the Lea down to

1904-496: The ecosystem , but also leads to de-oxygenation of the water. Dumping, litter and microplastics are a major problem on the Lea with much of this waste arriving in the river in sewage. In April 2021, Hackney Council wrote to the Environment Agency calling for action to address sewage discharge and pollution in the river. In November 2021, local volunteers stated they were removing 100kg of plastic pollution from

1972-537: The 2000s led to the reemergence of native speakers for both languages following their adoption by adults and children. By the 21st century, there were roughly one million total speakers of Celtic languages, increasing to 1.4 million speakers by 2010. Gaelainn / Gaeilig / Gaeilic Celtic is divided into various branches: Scholarly handling of Celtic languages has been contentious owing to scarceness of primary source data. Some scholars (such as Cowgill 1975; McCone 1991, 1992; and Schrijver 1995) posit that

2040-586: The 6th century AD. SIL Ethnologue lists six living Celtic languages, of which four have retained a substantial number of native speakers. These are: the Goidelic languages ( Irish and Scottish Gaelic , both descended from Middle Irish ) and the Brittonic languages ( Welsh and Breton , descended from Common Brittonic ). The other two, Cornish (Brittonic) and Manx (Goidelic), died out in modern times with their presumed last native speakers in 1777 and 1974 respectively. Revitalisation movements in

2108-559: The Gallic and Brittonic languages are P-Celtic, while the Goidelic and Hispano-Celtic (or Celtiberian) languages are Q-Celtic. The P-Celtic languages (also called Gallo-Brittonic ) are sometimes seen (for example by Koch 1992) as a central innovating area as opposed to the more conservative peripheral Q-Celtic languages. According to Ranko Matasovic in the introduction to his 2009 Etymological Dictionary of Proto-Celtic : "Celtiberian ...

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2176-492: The Insular Celtic hypothesis "widely accepted". When referring only to the modern Celtic languages, since no Continental Celtic language has living descendants, "Q-Celtic" is equivalent to "Goidelic" and "P-Celtic" is equivalent to "Brittonic". How the family tree of the Celtic languages is ordered depends on which hypothesis is used: " Insular Celtic hypothesis " " P/Q-Celtic hypothesis " Eska evaluates

2244-465: The Insular Celtic languages were probably not in great enough contact for those innovations to spread as part of a sprachbund . However, if they have another explanation (such as an SOV substratum language), then it is possible that P-Celtic is a valid clade, and the top branching would be: Within the Indo-European family, the Celtic languages have sometimes been placed with the Italic languages in

2312-491: The Larzac piece of lead (1983), the analysis of which reveals another common phonetical innovation -nm- > -nu (Gaelic ainm / Gaulish anuana , Old Welsh enuein 'names'), that is less accidental than only one. The discovery of a third common innovation would allow the specialists to come to the conclusion of a Gallo-Brittonic dialect (Schmidt 1986; Fleuriot 1986). The interpretation of this and further evidence

2380-454: The Lea at Hackney, is the reputed site of a victory of Aescwine of Essex over Octa of Kent in 527, which allowed Aescwine to become the first King of Essex . However, the historicity of these events and the very existence of Aescwine are disputed. Somewhere between 878 and 890, the Treaty of Alfred and Guthrum was drawn up that amongst other things used the course of the Lea to define

2448-568: The Lea was subsequently used as the boundary between English-ruled territory to the west and the Danelaw , established in the late 9th century, to the east. From around the ninth or tenth century, and the establishment of counties in this part of England, the Lea-Stort line has formed the historic boundary between Essex to the east and Hertfordshire and Middlesex to the west. Within London

2516-678: The Lee Valley youth hostel at Cheshunt before flowing under Windmill Lane close to Cheshunt railway station . It flows close to the Lea Valley railway line and then between Bowyers Water and the River Lee Navigation before passing under the A121 road close to Waltham Cross to the west and Waltham Abbey to the east. The river passes under the M25 motorway into Rammey Marsh to merge with Turkey Brook below Enfield Lock close to

2584-466: The Lower Lea every month. Water extraction, for drinking water, farming and industry, has led to a reduction in river flow impacting wildlife and concentrating the pollutants present in the remaining river water. Projects such as that led by Thames21 installing reedbeds help to remove pollutants whilst oxygenating the water, as well as creating habitat for the likes of water voles and improving

2652-460: The P-/Q-Celtic hypothesis. Proponents of each schema dispute the accuracy and usefulness of the other's categories. However, since the 1970s the division into Insular and Continental Celtic has become the more widely held view (Cowgill 1975; McCone 1991, 1992; Schrijver 1995), but in the middle of the 1980s, the P-/Q-Celtic theory found new supporters (Lambert 1994), because of the inscription on

2720-550: The Thames, it is generally more practical to follow the Limehouse Cut (which meets the Lea at Bow Locks) down to Limehouse Basin , and use the Limehouse Basin Lock to join the Thames. The communities on the west side of the lower Lea include Hackney , Bow and Bromley-by-Bow . On the east side, they include southern parts of Walthamstow , then Leyton , Stratford and West Ham . The last few miles of

2788-530: The aesthetics of the man-made concrete sections of the canalised river. In their early days, Tottenham Hotspur played their games at Tottenham Marshes on the Middle Lea while Leyton Orient have had a number of home grounds in the Lower Lea Valley , with both having their current grounds within a mile of the river. West Ham United was established as the works team of the Thames Ironworks ,

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2856-442: The area that year, ahead of the 2012 Olympic Games . The river is threatened by pollution, with sewage frequently discharged into the river as well as less common events causing major damage, such as an oil leak in 2018, or the toxic runoff from a warehouse fire in 2019. The sewage pollution, as well as that of fertiliser washed in from agricultural fields causes eutrophication , an excess of nutrients, which not only unbalances

2924-637: The border between the Danes and the English. In 894, a force of Danes sailed up the river to Hertford, and in about 895 they built a fortified camp, in the higher reaches of the Lea, about 20 miles (32.2 km) north of London. Alfred the Great saw an opportunity to defeat the Danes and dug a new channel to lower the level of the river, leaving the Danes stranded. In 1216, during the First Barons' War ,

2992-482: The boundaries of the London Boroughs of Haringey and Hackney and form part of a broad undeveloped green space, a mile (800 m) wide in places, which extends deep into London. On Hackney's northern edge, the Lea shifts to a south-south-easterly direction, the reservoirs end, but the broad green corridor continues as the river passes through Walthamstow Marshes , Leyton Marshes , Hackney Marshes and

3060-540: The break-up much earlier at 3200 BC ± 1500 years. They support the Insular Celtic hypothesis. The early Celts were commonly associated with the archaeological Urnfield culture , the Hallstatt culture , and the La Tène culture , though the earlier assumption of association between language and culture is now considered to be less strong. There are legitimate scholarly arguments for both the Insular Celtic hypothesis and

3128-474: The evidence as supporting the following tree, based on shared innovations , though it is not always clear that the innovations are not areal features . It seems likely that Celtiberian split off before Cisalpine Celtic, but the evidence for this is not robust. On the other hand, the unity of Gaulish, Goidelic, and Brittonic is reasonably secure. Schumacher (2004, p. 86) had already cautiously considered this grouping to be likely genetic, based, among others, on

3196-477: The extreme hardness (high mineral content) of London tap water. The name of the River Lea was first recorded in the 9th century, although is believed to be much older. Spellings from the Anglo-Saxon period include Lig(e)an in 880 and Lygan in 895, and in the early medieval period it is usually Luye or Leye . It seems to be derived from a Celtic (brythonic) root lug -meaning 'bright or light' which

3264-531: The future Louis VIII of France besieged Hertford Castle for a month, leading to its surrender. He only held the castle for a relatively short time as he lost the war soon after. In 1648 during the second English Civil War a Royalist force crossed the Thames from Greenwich and hoped to cross Bow Bridge, over the Lea and into Essex. After inconclusive clashes with the Tower Hamlets Militia and other Parliamentarian forces, an engagement known as

3332-662: The largely rural Essex bank, and then Chingford and Walthamstow in east London. South of Hertford, the river is lined by lakes; to the north these are primarily flooded former gravel pits but in London they are reservoirs: the 13 reservoirs of the Lee Valley Reservoir Chain , fed by the branches of the river known as the River Lee Flood Relief Channel and the River Lee Diversion . These reservoirs come to an end on

3400-487: The largest rivers in London and the easternmost major tributary of the Thames. The river's significance as a major east–west barrier and boundary has tended to obscure its importance as north–south trade route. Below Hertford the river has since medieval times had alterations made to make it more navigable for boats between the Thames and eastern Hertfordshire and Essex , known as the Lee Navigation . This stimulated much industry along its banks. The navigable River Stort ,

3468-526: The main tributary, joins it at Hoddesdon . While the lower Lea remains somewhat polluted, its upper stretch and tributaries, classified as chalk streams , are a major source of drinking water for London. An artificial waterway known as the New River , opened in 1613, abstracts clean water away from the upper stretch of the river near Hertford for drinking. The Lea's origin in the Chilterns contributes to

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3536-487: The marshes known as Wanstead Slip (now in Leyton). The route then continued through Essex to Colchester . At this time, the Lea was a wider river, and the tidal estuary stretched as far as Hackney Wick . Evidence has been found of a late Roman settlement at Old Ford, dating from the 4th and 5th centuries. In 1110, Matilda , wife of Henry I , reputedly took a tumble at the ford, on her way to Barking Abbey and ordered

3604-403: The most important tributary of the Lea, joins a short distance from Hertford at Feildes Weir , and is itself navigable as far upstream as Bishops Stortford . The Hertford East railway line passes along the west side of the Lea's flood plain, from Hertford to Tottenham, improving the accessibility of the area and contributing to the ribbon development that made the character of the west side of

3672-459: The northwestern fringe of Europe and a few diaspora communities . There are six living languages: the four continuously living languages Breton , Irish , Scottish Gaelic and Welsh , and the two revived languages Cornish and Manx . All are minority languages in their respective countries, though there are continuing efforts at revitalisation . Welsh is an official language in Wales and Irish

3740-486: The occasional seal . Some boat trippers reported observing on 5 August 2005 a Canada goose being pulled underwater very quickly. The London Wildlife Trust suggested that this was most likely caused by a pike . In 2011, Mike Wells claimed that he saw a "goose go vertically down" in the river. Again a pike or mink was suggested as most likely. Vice Magazine suggested that Wells' story may have been invented to publicise authorities' attempts to evict houseboats from

3808-407: The only living Celtic language spoken in continental Europe, is descended from the language of settlers from Britain. There are a number of extinct but attested continental Celtic languages , such as Celtiberian , Galatian and Gaulish . Beyond that there is no agreement on the subdivisions of the Celtic language family. They may be divided into P-Celtic and Q-Celtic . The Celtic languages have

3876-480: The other than had been possible before. Lea Bridge , the second bridge over the lower Lea was built after 1757, to replace the pre-existing ferry. It connected Clapton to the west, and Leyton and Walthamstow to the east. The Iron Bridge carrying the Barking Road over the river to Canning Town was built in 1810. There are significantly more crossings over the more central Lower Lea , than there are over

3944-469: The primary distinction is between Continental Celtic and Insular Celtic , arguing that the differences between the Goidelic and Brittonic languages arose after these split off from the Continental Celtic languages. Other scholars (such as Schmidt 1988) make the primary distinction between P-Celtic and Q-Celtic languages based on the replacement of initial Q by initial P in some words. Most of

4012-468: The river and its surrounding land has been recognised through inclusion in a number of parks and by several planning policy designations. Much of the river lies within the Lee Valley Park . Some of the land surrounding the river has been designated as Metropolitan Green Belt or Metropolitan Open Land in order to prevent further urbanisation. The river contains fish and other wildlife such as

4080-466: The river are known as Bow Creek and the river meets the Thames between Blackwall (on the west side) and Canning Town (on the east). In the Roman era , Old Ford , as the name suggests, was the most downstream crossing point of the River Lea. This was part of a pre-Roman route that followed the modern Oxford Street , Old Street , through Bethnal Green to Old Ford and then across a causeway through

4148-459: The river for burying in Ware, but there is no evidence for this. The extensive level of waterborne trade led the historian John Stow , writing in 1603, to describe the Lea as “this pleasant and useful river”. The riverside has hosted a number of major armaments manufacturers, such as the Waltham Abbey Royal Gunpowder Mills , the Royal Small Arms Factory at Enfield Lock (which is now a housing development known as Enfield Island Village ) and

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4216-451: The river is always used as a boundary between London Boroughs - which in turn inherit more ancient county and parish boundaries which also used the Lea as a boundary. Between 1889 and 1965, the lower Lea was the eastern boundary of the County of London with Essex . When reviewing the boundaries of London's parliamentary constituencies, the Boundary Commission treats the Thames and Lea as London's major internal barriers. It will not allow

4284-436: The shared reformation of the sentence-initial, fully inflecting relative pronoun *i̯os, *i̯ā, *i̯od into an uninflected enclitic particle. Eska sees Cisalpine Gaulish as more akin to Lepontic than to Transalpine Gaulish. Eska considers a division of Transalpine–Goidelic–Brittonic into Transalpine and Insular Celtic to be most probable because of the greater number of innovations in Insular Celtic than in P-Celtic, and because

4352-403: The succeeding centuries. In 1766, work also began on the Limehouse Cut to connect the river, at Bromley-by-Bow , with the Thames at Limehouse Basin . The Waterworks River , a part of the tidal Bow Back Rivers , has been widened by 8 metres (26 ft) and canalised to assist with construction of the Olympic Park for the 2012 Summer Olympics . In 2009, Three Mills Lock was installed on

4420-409: The valley much more developed than the east. Just after Hertford, the river passes the medieval river port of Ware and the Hertfordshire bank soon becomes entirely developed. On the west bank the river passes Hoddesdon , Broxbourne and Cheshunt in Hertfordshire; then Enfield , Edmonton , Tottenham and Tottenham Marshes in north London. On the eastern side the river passes Waltham Abbey on

4488-597: Was Gaelic. It has characteristics that some scholars see as archaic, but others see as also being in the Brittonic languages (see Schmidt). In the Insular/Continental classification schema, the split of the former into Gaelic and Brittonic is seen as being late. The distinction of Celtic into these four sub-families most likely occurred about 900 BC according to Gray & Atkinson but, because of estimation uncertainty, it could be any time between 1200 and 800 BC. However, they only considered Gaelic and Brythonic. A controversial paper by Forster & Toth included Gaulish and put

4556-441: Was constructed in 1613 to take clean water to London, from the Lea and its catchment areas in Hertfordshire and bypass the polluting industries that had developed in the Lea's downstream reaches. The artificial channel further reduced the flow to the natural river and by 1767 locks were installed below Hertford Castle Weir on the canalised part of the Lea, now the Lee Navigation with further locks and canalisation taking place during

4624-409: Was due to that section of the river’s role as the dividing line between territories, for instance separating Middlesex and Essex. By the 20th century 'Mereditch' had evolved to 'Mare Dyke' and referred to just one channel of the river between Chingford and Enfield . The channel was replaced by parts of the Lee Valley Reservoir Chain in the mid 20th century. The River Lea is the major component in

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