Middle Ages
Early documents mention a couple of tribes most probably living in Silesia. The Bavarian Geographer (ca. 845) specifies the following peoples: Slenzanie, Dzhadoshanie, Opolanie, Lupiglaa and Golenshitse. And a document of Prague bishopric (1086) mentions Zlasane, Trebovyane, Poborane and Dedositze.
In the 9th and 10th centuries the territory later called Silesia was subject to the Moravian and then Bohemian rulers of the neighbouring area covered by today's Czech Republic to the south.
About 990 Silesia was incorporated into Poland by Mieszko I (although some historians are moving the date to 999 and rule of Boleslaus I, duke of the Polanie and later king of Poland). During Poland's fragmentation (1138-1320) into duchies ruled by different branches of the Piast royal family, Silesia was ruled by descendants of the former royal family.
In 1146, senior duke Wladislaw II acknowledged the overlordship of the Holy Roman Empire over Poland, but was driven into exile. Seventeen years later, in 1163, his two sons took possession of Silesia with imperial backing, dividing the land between them as dukes of Lower and Upper Silesia. The policy of subdivision continued under their successors, with Silesia being divided into 16 principalities by the 1390s.
From around 1210 Henry I the Bearded, duke of Lower Silesia, and his wife Hedwig of Andechs invited the Knights Templar and other religious orders, many of them from what is now Germany, to settle the land. The ruling classes increasingly adopted German language and culture, causing great ethnic tensions in Silesia. Germans moved in from other parts of the Holy Roman Empire in the wake of the dislocation caused by the 1241 Mongol invasion of Silesia. 160 cities and 1500 towns were founded or relocated with German charters and laws (German law was however quickly separated from ethnicity of the founders and usually new Polish settlements were also located or relocated with German laws, which were considered more modern and superior to older, customary Polish laws).
In 1335, Duke Henry VI of Wroclaw and the Upper Silesian dukes recognized the overlordship of the king of Bohemia (John of Luxemburg). Last independent Piast duchies in Silesia ceased to exist in 1368. Since that time Silesia has indirectly become a part of the Holy Roman Empire, as Bohemia was itself an autonomous part of the empire. Silesia remained part of the lands of the Bohemian crown until 1740, under kings of Czech, Polish and German dynasties.
Under the emperor and king of Bohemia Charles IV, Silesia and especially Wroclaw gained greatly in importance, and many great buildings and large Gothic churches were built.
Between 1425 and 1435, devastation was caused by Hussite rebellion in Bohemia proper - Silesia remained largely Catholic however.
Early Modern Period
The Protestant reformation took an early hold, and most of Silesia became Lutheran.
- In 1526 Ferdinand made the elected crown of Bohemia an inherited possession of the Hagsburg family
- In 1537 the rulers of Brandenburg and Silesia concluded an inheritance treaty, but it was vetoed by the emperor Ferdinand I
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