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61-673: Upper Silesia is situated on the upper Oder River, north of the Eastern Sudetes mountain range and the Moravian Gate , which form the southern border with the historic Moravia region. Within the adjacent Silesian Beskids to the east, the Vistula River rises and turns eastwards, the Biała and Przemsza tributaries mark the eastern border with Lesser Poland . In the north, Upper Silesia borders on Greater Poland , and in

122-670: A period of refusal, confirmed the inviolability of the border in 1970 in the Treaty of Warsaw . In 1990 newly reunified Germany and the Republic of Poland signed a treaty recognizing the Oder–Neisse line as their border. On 11 August 2022, it was discovered that the Oder river had been contaminated and at least 135 tonnes of dead fish washed up on its shores. Water samples taken on 28 July indicated possible mesitylene contamination, although

183-431: A publication now in the public domain :  Chisholm, Hugh , ed. (1911). " Oder ". Encyclopædia Britannica . Vol. 20 (11th ed.). Cambridge University Press. pp. 2–3. Duchy of Silesia The Duchy of Silesia ( Polish : Księstwo śląskie , German : Herzogtum Schlesien , Czech : Slezské knížectví ) with its capital at Wrocław was a medieval provincial duchy of Poland located in

244-726: A re-unification of the Polish lands under the Silesian Piasts ended with the Mongol invasion of Poland and Henry's death at the 1241 Battle of Legnica . His eldest son Bolesław II the Bald could not prevail as High Duke against Bolesław V the Chaste of Lesser Poland and, after he regained Lubusz upon the death of his brother Mieszko in 1242, finally had to divide his Silesian heritage with his younger brothers in 1248: The subdivision of

305-667: A strip of land around Opole , for the first time creating the Duchy of Opole . In turn Jarosław had to prepare for an ecclesiastical career and remain celibate . Likewise Bolesław's and Mieszko's youngest brother, Konrad Spindleshanks , when he came of age claimed his rights and about 1177 received the Lower Silesian lands around Głogów ; leading to the first creation of the Duchy of Głogów . However, Bolesław I outlived both his youngest brother and his son, and both territories fell back to him in 1190 and 1201 resp. Bolesław I died in

366-651: Is a river in Central Europe . It is Poland's second-longest river and third-longest within its borders after the Vistula and its largest tributary the Warta . The Oder rises in the Czech Republic and flows 742 kilometres (461 mi) through western Poland, later forming 187 kilometres (116 mi) of the border between Poland and Germany as part of the Oder–Neisse line . The river ultimately flows into

427-666: Is only a narrow channel (Świna) going to the Bay of Pomerania , which forms a part of the Baltic Sea. The largest city on the Oder is Wrocław , in Lower Silesia . The Oder is navigable over a large part of its total length, as far upstream as the town of Koźle , where the river connects to the Gliwice Canal . The upstream part of the river is canalized and permits larger barges (up to CEMT Class IV ) to navigate between

488-593: Is the second longest river overall taking into account its total length, including parts in neighbouring countries. The Oder drains a basin of 119,074 square kilometres (45,975 sq mi), 106,043 km (40,943 sq mi) of which are in Poland (89%), 7,246 km (2,798 sq mi) in the Czech Republic (6%), and 5,587 km (2,157 sq mi) in Germany (5%). Channels connect it to

549-768: The Allies decided that the new eastern border of Germany would run along the Oder. After World War II, the former German areas east of the Oder and the Lusatian Neisse passed to Poland by decision of the victorious Allies at the Potsdam Conference (at the insistence of the Soviets). As a result, the so-called Oder–Neisse line formed the border between the Soviet occupation zone (from 1949 East Germany ) and Poland. The final border between Germany and Poland

610-776: The Bohemian kingdom . During the re-establishment of Poland under King Casimir III the Great , all Silesia was specifically excluded as non-Polish land by the 1335 Treaty of Trentschin becoming a land of the Bohemian Crown and — indirectly — of the Holy Roman Empire. By the mid-14th century, the influx of German settlers into Upper Silesia was stopped by the Black Death pandemic. Unlike in Lower Silesia,

671-586: The Duchy of Opava was established on adjacent Moravian territory, ruled by the Přemyslid duke Nicholas I , whose descendants inherited the Duchy of Racibórz in 1336. As they ruled both duchies in personal union , Opava grew into the Upper Silesian territory. In 1327 the Upper Silesian dukes, like most of their Lower Silesian cousins, had sworn allegiance to King John of Bohemia , thereby becoming vassals of

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732-670: The Duchy of Upper and Lower Silesia in 1742. The duchies which had remained in Poland were subsequently annexed by the Kingdom of Prussia ( New Silesia ) and the Habsburg monarchy ( Galicia ) during the 18th century Partitions of Poland . The Duchy of Upper and Lower Silesia lasted as a crown land of Cisleithanian Austria until 1918, whereupon it was divided between the Second Polish Republic ( Autonomous Silesian Voivodeship ) and Czechoslovakia ( Czech Silesia ) after

793-605: The Germanization process was halted; still a majority of the population spoke Polish and Silesian as their native language, often together with German ( Silesian German ) as a second language. In the southernmost areas, also Lach dialects were spoken. While Latin, Czech and German language were used as official languages in towns and cities, only in the 1550s (during the Protestant Reformation ) did records with Polish names start to appear. Upper Silesia

854-611: The Havel , Spree , Vistula system and Kłodnica . It flows through Silesian , Opole , Lower Silesian , Lubusz , and West Pomeranian voivodeships of Poland and the states of Brandenburg and Mecklenburg-Vorpommern in Germany. The main branch empties into the Szczecin Lagoon near Police, Poland . The Szczecin Lagoon is bordered on the north by the islands of Usedom (west) and Wolin (east). Between these two islands, there

915-589: The Przemsza and Biała rivers. The boundaries varied slightly in the following decades: at least when the duchy was re-established for the sons of Władysław II the Exile in 1163 (see below), it also comprised Lubusz Land northwest of Krosno , which had been the western outpost of Greater Poland and passed to the margraves of Brandenburg in 1248. In 1177 the Polish High Duke Casimir II

976-702: The Szczecin Lagoon north of Szczecin and then into three branches (the Dziwna , Świna and Peene ) that empty into the Bay of Pomerania of the Baltic Sea . The Oder is known by several names in different languages, but the modern ones are very similar: English and German: Oder ; Czech, Polish, and Lower Sorbian : Odra , Upper Sorbian : Wódra ; Kashubian : Òdra ( pronounced [ˈwɛdra] ); Medieval Latin : Od(d)era ; Renaissance Latin : Viadrus (invented in 1534). Ptolemy knew

1037-557: The "Duchy of Upper and Lower Silesia", colloquially called Austrian Silesia . Incorporated into the Prussian Silesia Province from 1815, Upper Silesia became an industrial area taking advantage of its plentiful coal and iron ore . Prussian Upper Silesia became a part of the German Empire in 1871. The earliest exact census figures on ethnolinguistic or national structure (Nationalverschiedenheit) of

1098-479: The 10th century, almost the entire course of the Oder River found itself within the borders of the newly formed Polish state, with the exception of the area around the source of the river, which was under Bohemian rule. Several important cities of medieval Poland developed along the Oder, including Opole which became the capital of Upper Silesia , Wrocław which became the capital of Lower Silesia and one of

1159-520: The 1335 Treaty of Trentschin . During the time of its establishment, the Silesian lands covered the basin of the upper and middle Oder river. In the south the Sudetes mountain range up to the Moravian Gate formed the border with the lands of Bohemia – including Kłodzko Land – and Moravia . After a more than century-long struggle, the boundary had just been determined by an 1137 agreement with

1220-744: The 1620 Battle of White Mountain , the Catholic Emperors of the Habsburg dynasty forcibly re-introduced Catholicism, led by the Jesuits . Lower Silesia and most of Upper Silesia were occupied by the Kingdom of Prussia in 1742 during the First Silesian War and annexed by the terms of the Treaty of Breslau . A small part south of the Opava River remained within the Habsburg-ruled Bohemian Crown as

1281-701: The 9th century Bavarian Geographer , the West Slavic Opolanie tribe had settled on the upper Oder River since the days of the Migration Period , centered on the gord of Opole . It is possible that during the times of Prince Svatopluk I (871–894), Silesia was a part of his Great Moravian realm. Upon its dissolution after 906, the region fell under the influence of the Přemyslid rulers of Bohemia , Duke Spytihněv I (894–915) and his brother Vratislaus I (915–921), possibly

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1342-601: The Austrian Habsburg monarchy until King Frederick II of Prussia invaded Silesia in 1740 and annexed most of it during the First Silesian War . The bulk of the duchy, enlarged by the County of Kladsko and Upper Lusatian territories annexed from Saxony , was subsequently reorganized as part of the Prussian Province of Silesia , while the duchies remaining under Austrian control were reconstituted as

1403-797: The Berlin waterways again. Near its mouth the Oder reaches the city of Szczecin , a major maritime port. The river finally reaches the Baltic Sea through the Szczecin Lagoon and the river mouth at Świnoujście . Under Germania Magna , the river was known to the Romans as the Viadrus or Viadua in Classical Latin , as it was a branch of the Amber Road from the Baltic Sea to the Roman Empire . In Germanic languages, including English, it

1464-646: The Bohemian duke Soběslav I . In the west Lower Silesia bordered on the German March of Lusatia (later Lower Lusatia ) and the former Milceni lands around Bautzen (later Upper Lusatia ) with the boundary running along the Bóbr and Kwisa rivers. Silesia was limited by the Polish provinces of Greater Poland in the north and the Seniorate Province of Lesser Poland in the east, separated by

1525-596: The Bohemian kingdom when he died without male heirs three months later. Silesia was incorporated into the Lands of the Bohemian Crown , after King Casimir III had acknowledged the acquisition by the 1348 Treaty of Namslau with King Charles IV — except for the Upper Silesian duchies of Oświęcim and Zator, which in the 16th century were integrated in the Polish Kraków Voivodeship , as well as

1586-542: The Duchy of Siewierz, that was purchased by the Archbishop of Kraków in 1443. As Henry VI left no male heirs, his lands were inherited by King John of Bohemia . The following maps illustrate continuing fragemtarization of the Duchy of Silesia, and shifting borders of the individual smaller duchies. After the inheritance of Bohemia by the House of Habsburg in 1526, the Silesian duchies gradually passed under control of

1647-623: The Just attached the former Lesser Polish castellanies of Bytom , Oświęcim , Zator , Siewierz und Pszczyna to Upper Silesia in favour of Duke Mieszko IV Tanglefoot . After Silesia as a whole had become a Bohemian fief according to the 1335 Treaty of Trentschin, these lordships – except for the state countries of Bytom and Pszczyna – returned to the Polish Crown . As the Silesian Province ( Polish : dzielnica śląska ),

1708-409: The Oder and Havel. After completion of the more straight Oder–Havel Canal in 1914, its economic relevance decreased. The earliest important undertaking to modify the river to improve navigation was initiated by Frederick the Great , who recommended diverting the river into a new and straight channel in the swampy tract known as Oderbruch near Küstrin ( Kostrzyn nad Odrą ). The work was carried out in

1769-648: The Pious upon his death in 1238, it seemed that the Polish fragmentation could be overcome and the will of Bolesław III Krzywousty would finally be fulfilled. Henry II in 1239 had to resign the regency of Upper Silesia in favour of his cousin Mieszko II the Fat . He anew defended Lubusz, this time against the forces of the Ascanian margraves of Brandenburg , and in 1241 granted it to his second son Mieszko . The hopes for

1830-401: The Polish prince Bolesław III Wrymouth (1107–1138) came to terms with Duke Soběslav I of Bohemia , when a peace was made confirming the border along the Sudetes . However, this arrangement fell apart when upon the death of Bolesław III and his testament the fragmentation of Poland began, which decisively enfeebled its central authority. The newly established Duchy of Silesia became

1891-490: The Prussian part of Upper Silesia, come from year 1819. The last pre-WW1 general census figures available, are from 1910 (if not including the 1911 census of school children - Sprachzählung unter den Schulkindern - which revealed a higher percent of Polish-speakers among school children than the 1910 census among the general populace). Figures ( Table 1. ) show that large demographic changes took place between 1819 and 1910, with

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1952-488: The Silesian duchies increased over the following generations and accompanied the fragmentation of Poland . Henry's III son Henry IV Probus upon the death of his uncle Władysław in 1270 ruled at Wrocław and in 1288 even became High Duke of Poland, until the male line became extinct with his death in 1290. He was succeeded by his cousin Duke Henry V the Fat , son of Henry's III brother Bolesław II, who once again re-united

2013-646: The Upper Silesian Duchy of Racibórz as an allodium from the hands of his elder brother Duke Bolesław I the Tall of Silesia. In the struggle around the Polish throne, Mieszko additionally received the former Lesser Polish lands of Bytom , Oświęcim , Zator , Siewierz and Pszczyna from the new Polish High Duke Casimir II the Just in 1177. When in 1202 Mieszko Tanglefoot had annexed the Duchy of Opole of his deceased nephew Jarosław , he ruled over all Upper Silesia as Duke of Opole and Racibórz . In

2074-626: The ancestral homeland of the Silesian Piasts , descendants of Bolesław's eldest son Władysław II the Exile , who nevertheless saw themselves barred from the succession to the Polish throne and only were able to regain their Silesian home territory with the aid of the Holy Roman Emperor . The failure of the Agnatic seniority principle of inheritance also led to the split-up of the Silesian province itself: in 1172 Władysław's second son Mieszko IV Tanglefoot claimed his rights and received

2135-467: The course of the Ostsiedlung , establishing numerous cities according to German town law . The plans to re-unify Silesia shattered upon the first Mongol invasion of Poland and the death of Duke Henry II the Pious at the 1241 Battle of Legnica . Upper Silesia further fragmented upon the death of Duke Władysław Opolski in 1281 into the duchies of Bytom , Opole, Racibórz and Cieszyn . About 1269

2196-546: The duchies of Wrocław and Legnica under his personal rule. The duchy lost its southern territories in 1290–1291, i.e. the Kłodzko Land , which passed to Bohemia, and the towns of Świdnica , Rychbach , Ząbkowice , Ziębice and Strzelin , which passed to the Duchy of Jawor after Duke Bolko I the Strict of Jawor supported Henry V's assumption of the Duchy of Wrocław. Nevertheless, upon the death of Henry V in 1296, his heritage

2257-460: The duchy in 1163. As long as they were under pressure by High Duke Bolesław IV, they ruled jointly at Wrocław , until tensions between them erupted into an open conflict in 1172. As a result, the brothers divided the duchy among themselves; the first partition of many which led to the creation of numerous Silesian duchies in the following centuries: After a revolt by Bolesław's eldest son, Jarosław , who feared for his heritage, his father ceded him

2318-508: The duchy was one of five main provinces established in medieval Poland according to the Testament of Bolesław III Krzywousty . By the terms of the will from 1138–1146 it was controlled by the Senior Duke of Poland or High duke , Bolesław's first-born son Władysław II the Exile , who also held the Duchy of Kraków. The testament however failed to prevent a violent inheritance conflict between Władysław and his younger half-brothers, who allied against him. After his failed bid to take control of

2379-402: The early 13th century the ties of the Silesian Piasts with the neighbouring Holy Roman Empire grew stronger as several dukes married scions of German nobility. Promoted by the Lower Silesian Duke Henry I the Bearded , from 1230 also regent over Upper Silesia for the minor sons of his late cousin Duke Casimir I of Opole , large parts of the Silesian lands were settled with German immigrants in

2440-432: The entire Kingdom in 1146, he lost his status as the senior duke, was excommunicated by Archbishop Jakub ze Żnina of Gniezno and fled to the Holy Roman Empire . The duchy was then under control of his half-brother High Duke Bolesław IV the Curly . With support from Emperor Frederick I Barbarossa , who had campaigned in Greater Poland in 1157 and forced Bolesław IV to cede Silesia, Władysław's sons were able to return to

2501-577: The founder and name giver of the Silesian capital Wrocław ( Czech : Vratislav ). By 990 the newly installed Piast duke Mieszko I of the Polans had conquered large parts of Silesia. From the Middle Silesia fortress of Niemcza , his son and successor Bolesław I the Brave (992–1025), having established the Diocese of Wrocław , subdued the Upper Silesian lands of the pagan Opolanie, which for several hundred years were part of Poland , though contested by Bohemian dukes like Bretislaus I , who from 1025 invaded Silesia several times. Finally, in 1137,

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2562-413: The industrial sites around the Wrocław area. Further downstream the river is free-flowing, passing the towns of Eisenhüttenstadt (where the Oder–Spree Canal connects the river to the Spree in Berlin) and Frankfurt upon the Oder . Downstream of Frankfurt the river Warta forms a navigable connection with Poznań and Bydgoszcz for smaller vessels. At Hohensaaten the Oder–Havel Canal connects with

2623-531: The main cities and ports of the Pomerania region and the entire southern coast of the Baltic Sea. From the 13th century on, the Oder valley was central to German Ostsiedlung , making the towns on its banks German-speaking over the following centuries. Over time, control over parts of the river was taken from Poland by other countries, including the Margraviate of Brandenburg and the Kingdom of Bohemia , and later also by Hungary , Sweden , Prussia and Germany . The Finow Canal , first built in 1605, connects

2684-418: The main cities of the entire Kingdom of Poland (Latin: sedes regni principales ), and Lubusz (now Lebus) which became the capital of the Lubusz Land , nicknamed "the key to the Kingdom of Poland" in medieval chronicles. Wrocław and Lubusz became seats of some of the oldest Catholic bishoprics of Poland, founded in 1000 ( Wrocław ) and 1125 ( Lubusz ). Located near the mouth of the river, Szczecin became one of

2745-420: The margrave's death in 1210. He had to defend Lubusz once more against the campaigns of Landgrave Louis IV of Thuringia from 1221. Upon the death of his cousin Duke Casimir I of Opole , son of Mieszko I Tanglefoot, in 1230, he acted as guardian of his minor nephews, thereby once again ruling over whole Silesia. In 1232 he became High Duke of Poland, and as he was able to secure the succession of his son Henry II

2806-413: The modern Oder as the Συήβος ( Suebos ; Latin Suevus ), a name apparently derived from the Suebi , a Germanic people. While he also refers to an outlet in the area as the Οὐιαδούα Ouiadoua (or Οὐιλδούα Ouildoua ; Latin Viadua or Vildua ), this was apparently the modern Wieprza , as it was said to be a third of the distance between the Suebos and Vistula . The name Suebos may be preserved in

2867-406: The modern name of the Świna river (German Swine ), an outlet from the Szczecin Lagoon to the Baltic. The Oder is 840 kilometres (522 miles) long: 112 km (70 miles) in the Czech Republic, 726 km (451 miles) in Poland (including 187 km (116 miles) on the border between Germany and Poland). It is the third longest river located within Poland (after the Vistula and Warta); however, it

2928-426: The region of Silesia . Soon after it was formed under the Piast dynasty in 1138, it fragmented into various Silesian duchies. In 1327, the remaining Duchy of Wrocław as well as most other duchies ruled by the Silesian Piasts passed under the suzerainty of the Kingdom of Bohemia as the Duchies of Silesia . The acquisition was completed when King Casimir III the Great of Poland renounced his rights to Silesia in

2989-1139: The region's total population quadrupling, the percent of German-speakers increasing significantly, and that of Polish-speakers declining considerably. Also, the total land area in which Polish language was spoken, as well as the land area in which it was spoken by the majority, declined between 1790 and 1890. Polish authors before 1918 estimated the number of Poles in Prussian Upper Silesia as slightly higher than according to official German censuses. (67.2%) (61.1%) (62.0%) (62.6%) (62.1%) (58.6%) (58.1%) (58.1%) (58.6%) (58.7%) (57.3%) (59.1%) (59.8%) or up to 1,560,000 together with bilinguals (29.0%) (37.3%) (36.1%) (35.6%) (36.3%) (36.8%) (37.4%) (37.2%) (36.5%) (36.5%) (38.1%) (36.3%) (36.8%) (3.8%) (1.6%) (1.9%) (1.8%) (1.6%) (4.6%) (4.5%) (4.7%) (4.9%) (4.8%) Oder The Oder ( / ˈ oʊ d ər / OH -dər , German: [ˈoːdɐ] ; Czech , Lower Sorbian and Polish : Odra ; Upper Sorbian : Wódra [ˈwʊtʁa] )

3050-417: The rivers Albis (Elbe) , Oder, and Vistula . Centuries later, after Germanic tribes, the Bavarian Geographer (ca. 845) specified the following West Slavic peoples: Sleenzane , Dadosesani, Opolanie , Lupiglaa, and Golensizi in Silesia and Wolinians with Pyrzycans in Western Pomerania . A document of the Bishopric of Prague (1086) mentions Zlasane, Trebovyane, Poborane, and Dedositze in Silesia. In

3111-409: The same year and was succeeded by his only surviving son Henry I the Bearded , who soon entered into conflict with his Piast relatives as well as with his German neighbours. In 1202 he had to face the invasion of his uncle Mieszko I, who, still dissatisfied with the 1172 partition, annexed the Opole territory of late Jarosław. The Duchy of Opole remained with the estates of Mieszko's descendants, whereby

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3172-443: The secession of Upper Silesia was conclusive. In 1206 Henry I came to an agreement with the Polish High Duke Władysław III Spindleshanks to swap Lubusz Land for the Greater Polish Kalisz region. The plan however was foiled, when Władysław III lost the seniorate and furthermore Lubusz was occupied by the troops of the Wettin margrave Conrad II of Lusatia. Duke Henry had to struggle for his northwestern outpost, which he regained upon

3233-437: The toxin was not present in samples taken after 1 August. Main section: Szczecin Lagoon : east: Dziwna (German: Dievenow ) branch (between Wolin Island and mainland Poland): middle: Świna (German: Swine ) branch (between Wolin and Usedom islands): west: Peenestrom ( Peene ) (Polish: Piana ) branch (between Usedom Island and mainland Germany): [REDACTED]   This article incorporates text from

3294-427: The west on the Lower Silesian lands (the adjacent region around Wrocław also referred to as Middle Silesia ). It is currently split into a larger Polish and the smaller Czech Silesian part, which is located within the Czech regions of Moravia-Silesia and Olomouc . The Polish Upper Silesian territory covers most of the Opole Voivodeship , except for the Lower Silesian counties of Brzeg and Namysłów , and

3355-404: The western half of the Silesian Voivodeship (except for the Lesser Polish counties of Będzin , Bielsko-Biała , Częstochowa with the city of Częstochowa , Kłobuck , Myszków , Zawiercie and Żywiec , as well as the cities of Dąbrowa Górnicza , Jaworzno and Sosnowiec ). Divided Cieszyn Silesia as well as former Austrian Silesia are historical parts of Upper Silesia. According to

3416-423: The years 1746–53, a large tract of marshland being brought under cultivation, a considerable detour cut off and the mainstream successfully confined to a canal. In the late 19th century, three additional alterations were made to the waterway: By the Treaty of Versailles , navigation on the Oder became subject to International Commission of the Oder. Following the articles 363 and 364 of the Treaty Czechoslovakia

3477-482: Was again partitioned among his sons. The second, Duke Henry VI the Good , in order to ward off claims raised by his elder brother Duke Bolesław III the Generous of Legnica, in 1327 signed an inheritance treaty with King John of Bohemia , like most of the Silesian duchies had been vassalized by the Kingdom of Bohemia in the early 14th century. As the Polish king Casimir III in the 1335 Treaty of Trentschin had renounced Silesia, Henry's VI duchy passed without opposition to

3538-493: Was and still is called the Oder , written in medieval Latin documents as Odera or Oddera . Most notably, it was mentioned in the Dagome iudex , which described territory of the Duchy of Poland under Duke Mieszko I in A.D. 990, as a part of Poland's western frontier, however, in most sections the border ran west of the river. Before Slavs settled along its banks, the Oder was an important trade route, and towns in Germania were documented along with many tribes living between

3599-426: Was entitled to lease in Stettin (now Szczecin) its own section in the harbor, then called Tschechoslowakische Zone im Hafen Stettin . The contract of lease between Czechoslovakia and Germany , and supervised by the United Kingdom , was signed on 16 February 1929, and would end in 2028, however, after 1945 Czechoslovakia did not regain this legal position, de facto abolished in 1938–39. At the 1943 Tehran Conference

3660-461: Was hit by the Hussite Wars and in 1469 was conquered by King Matthias Corvinus of Hungary , while the Duchies of Oświęcim and Zator fell back to the Polish Crown as a part of Lesser Poland . Upon the death of the Jagiellonian king Louis II in 1526, the Bohemian crown lands were inherited by the Austrian House of Habsburg . In the 16th century, large parts of Silesia had turned Protestant , promoted by reformers like Caspar Schwenckfeld . After

3721-449: Was to be determined at a future peace conference. A part of the German population east of these two rivers was evacuated by the Nazis during the war or fled from the approaching Red Army . After the war, the remaining 8 million Germans were expelled from these territories by the Polish and Soviet administrations. East Germany confirmed the border with Poland under Soviet pressure in the Treaty of Zgorzelec in 1950. West Germany , after

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