Silesia (see names below) is a historical region of Central Europe that now lies mostly within Poland, with small parts in the Czech Republic and Germany. Situated along the Oder River, with the Sudeten Mountains extending across the southern border, Silesia spans , and its population is estimated at 8,000,000. It is split into two main subregions, Lower Silesia in the west and Upper Silesia in the east. The largest city and Lower Silesia's capital is Wrocław; the historic capital of Upper Silesia is Opole. The biggest metropolitan area is the Katowice metropolitan area, the centre of which is Katowice. Parts of the Czech city of Ostrava and the German city of Görlitz are situated within Silesia's historical borders.

Silesia is a heavily industrialised region, rich in natural resources, and its culture reflects its complex history and diverse influences, comprising Polish, Czech, and German elements. The region is known for its distinctive Silesian language (still spoken by a minority in Upper Silesia), richly decorated folk costumes, regional cuisine, and a mix of Gothic, Baroque, and industrial-era architecture seen in its cities and towns. The region contains many historical landmarks and UNESCO World Heritage Sites. Silesia's borders and national affiliation have changed over time, both when it was a hereditary possession of noble houses and after the rise of modern nation-states, resulting in an abundance of castles and strongholds, especially in the Jelenia Góra valley.

First held by Great Moravia at the end of the 9th century and Bohemia in the early 10th century, Silesia was incorporated into the early Polish state, and after its fragmentation in the 12th century it formed the Duchy of Silesia. As a result of further fragmentation, it was divided into individual duchies, ruled by various lines of the Polish Piast dynasty. In the 14th century, it became a constituent part of the Bohemian Crown Lands under the Holy Roman Empire, which passed to the Austrian Habsburg Monarchy in 1526; however, a number of duchies remained under the rule of Polish dukes (Piast, Jagiellon, Sobieski) as formal Bohemian fiefdoms. As a result of the Silesian Wars, the region was annexed by Prussia from Austria in 1742 and subsequently became a part of the German Empire in 1871.

After World War I, when the Poles and Czechs regained their independence, the easternmost part of Upper Silesia became part of Poland by the decision of the Entente Powers after insurrections by Poles and the Upper Silesian plebiscite, while the remaining former Austrian parts of Silesia were divided between Czechoslovakia and Poland. During World War II, as a result of German occupation the entire region was under control of Nazi Germany. In 1945, after World War II, most of the German-held Silesia was transferred to Polish jurisdiction by the Potsdam Agreement between the victorious Allies and became part of Poland. The small Lusatian strip west of the Oder–Neisse line, which had belonged to Silesia since 1815, became part of East Germany. As the result of the forced population shifts of 1945–48, today's inhabitants of Silesia speak the national languages of their respective countries.

Etymology

The names of Silesia in different languages most likely share their etymology— ; ; ; ; ; ; ; ; Latin, Spanish and English: Silesia; Portuguese: Silésia; ; ; . The names all relate to the name of a river (now Ślęza) and mountain (Mount Ślęża) in mid-southern Silesia, which served as a place of cult for pagans before Christianization.

Ślęża is listed as one of the numerous Pre-Indo-European topographic names in the region (see old European hydronymy).Zbigniew Babik, "Najstarsza warstwa nazewnicza na ziemiach polskich w granicach średniowiecznej Słowiańszczyzny", Uniwersitas, Kraków, 2001. According to some Polonists, the name Ślęża or Ślęż is directly related to the Old Polish words ślęg or śląg , which means dampness, moisture, or humidity.Rudolf Fischer. Onomastica slavogermanica. Uniwersytet Wrocławski. 2007. t. XXVI. 2007. str. 83 They disagree with the hypothesis of an origin for the name Śląsk from the name of the Silings tribe.

In Polish common usage, "Śląsk" refers to traditionally Polish Upper Silesia and today's Silesian Voivodeship, but less to Lower Silesia, which is different from Upper Silesia in many respects as its population was predominantly German-speaking from around the mid-19th century until 1945–48.

History

Anitquity In the fourth century BC from the south, through the Kłodzko Valley, the Celts entered Silesia, and settled around Mount Ślęża near modern Wrocław, Oława and Strzelin.R. Żerelik(in:) M. Czpliński (red.) Historia Śląska, Wrocław 2007, pp. 34–35

Germanic Lugii tribes were first recorded within Silesia in the 1st century BC. West Slavs and Lechites arrived in the region around the 7th century,R. Żerelik(in:) M. Czpliński (red.) Historia Śląska, Wrocław 2007, pp. 37–38 and by the early ninth century, their settlements had stabilized. Local West Slavs started to erect boundary structures like the Silesian Przesieka and the Silesia Walls. The eastern border of Silesian settlement was situated to the west of the Bytom, and east from Racibórz and Cieszyn. East of this line dwelt a closely related Lechitic tribe, the Vistulans. Their northern border was in the valley of the Barycz River, north of which lived the Western Polans tribe who gave Poland its name.R. Żerelik(in:) M. Czpliński (red.) Historia Śląska, Wrocław 2007, pp. 21–22

10th–13th century

The first known states in Silesia were Greater Moravia and Bohemia. In the 10th century, the Polish ruler Mieszko I of the Piast dynasty incorporated Silesia into the newly established Polish state. In 1000, the Diocese of Wrocław was established as the oldest Catholic diocese in the region, and one of the oldest dioceses in Poland, subjugated to the Roman Catholic Archdiocese of Gniezno. Poland repulsed German invasions of Silesia in 1017 at Niemcza and in 1109 at Głogów. During the Fragmentation of Poland, Silesia and the rest of the country were divided into many smaller duchies ruled by various Silesian dukes. In 1178, parts of the Duchy of Kraków around Bytom, Oświęcim, Chrzanów, and Siewierz were transferred to the Silesian Piasts, although their population was primarily Vistulan and not of Silesian descent.

Walloons came to Silesia as one of the first foreign immigrant groups in Poland, probably settling in Wrocław since the 12th century, with further Walloon immigrants invited by Duke Henry the Bearded in the early 13th century. Since the 13th century, German cultural and ethnic influence increased as a result of immigration from German-speaking states of the Holy Roman Empire.

The first granting of municipal privileges in Poland took place in the region, in the town of Złotoryja by Henry the Bearded. Medieval municipal rights modeled after Lwówek Śląski and Środa Śląska, both established by Henry the Bearded, became the basis of municipal form of government for several cities and towns in Poland, and two of five local Polish variants of medieval town rights. The Book of Henryków, which contains the earliest known sentence written in the Polish language, as well as a document which contains the oldest printed text in Polish, were created in Henryków and Wrocław in Silesia, respectively.

In 1241, the Mongols conducted their first invasion of Poland, causing widespread panic and mass flight. They looted much of the region and defeated the combined Polish, Moravian and German forces led by Duke Henry II the Pious at the Battle of Legnica, which took place at Legnickie Pole near the city of Legnica. Upon the death of Orda Khan, the Mongols chose not to press forward further into Europe, but returned east to participate in the election of a new Grand Khan (leader).

Between 1289 and 1292, Bohemian king Wenceslaus II became suzerain of some of the Upper Silesian duchies. Polish monarchs had not renounced their hereditary rights to Silesia until 1335.R. Żerelik(in:) M. Czpliński (red.) Historia Śląska, Wrocław 2007, p. 81 The province became part of the Bohemian Crown which was part of the Holy Roman Empire; however, a number of duchies remained under the rule of the Polish dukes from the houses of Piast, Jagiellon and Sobieski as formal Bohemian fiefdoms, some until the 17th–18th centuries. Between 1469 and 1490, the region was under the rule of Matthias Corvinus, who claimed the Bohemian throne. In 1526 Silesia passed with the Bohemian Crown to the Habsburg monarchy.

15th–19th century

In the 15th century, several changes were made to Silesia's borders. Parts of the territories that had been transferred to the Silesian Piasts in 1178 were bought by the Polish kings in the second half of the 15th century (the Duchy of Oświęcim in 1457; the Duchy of Zator in 1494). The Bytom area remained in the possession of the Silesian Piasts, though it was a part of the Diocese of Kraków. The Duchy of Krosno Odrzańskie () was inherited by the Margraviate of Brandenburg in 1476 and with the renunciation of King Ferdinand I and the estates of Bohemia in 1538, became an integral part of Brandenburg. From 1645 until 1666, the Duchy of Opole and Racibórz was held in pawn by the Polish House of Vasa as dowry of the Polish queen Cecylia Renata.

In 1742, most of Silesia was seized by King Frederick II of Prussia in the War of the Austrian Succession, eventually becoming the Prussian Province of Silesia in 1815; consequently, Silesia became part of the German Empire when it was proclaimed in 1871. The Silesian capital Breslau became at that time one of the big cities in Germany. Breslau was a center of Jewish life in Germany and an important place of science (university) and industry (manufacturing of locomotives). German mass tourism started in the Silesian mountain region (Hirschberg, Schneekoppe).

20th century After World War I, a part of Silesia, Upper Silesia, was contested by Germany and the newly independent Second Polish Republic. The League of Nations organized a plebiscite to decide the issue in 1921. It resulted in 60% of votes being cast for Germany and 40% for Poland.gonschior.de (in German) Following the third Silesian uprising (1921), however, the easternmost portion of Upper Silesia (including Katowice), with a majority ethnic Polish population, was awarded to Poland, becoming the Silesian Voivodeship. The Prussian Province of Silesia within Germany was then divided into the provinces of Lower Silesia and Upper Silesia. Meanwhile, Austrian Silesia, the small portion of Silesia retained by Austria after the Silesian Wars, was mostly awarded to the new Czechoslovakia (becoming known as Czech Silesia and Trans-Olza), although most of Cieszyn and territory to the east of it went to Poland.