Duchy of Silesia
Medieval duchy in Poland
Duchy of Silesia
The Duchy of Silesia (Polish: Księstwo Śląskie, German: Herzogtum Schlesien, Czech: Slezské knížectví, Silesian: Ślōnski firsztyntōm) with its capital at Wrocław was a medieval provincial duchy of Poland located in 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 the 1335 Treaty of Trentschin.
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