Ziębica

Ziębice was a Silesian Piast duchy centered on Ziębice. In 1337 Duke Bolko II held it under Bohemian suzerainty, which he had recognized in the Treaty of Straubing in 1336.

His son Nicholas ruled until 1358. The Piast line ended in 1428 when Duke Jan died fighting the Hussites at Altwilmsdorf, and the duchy passed to the Bohemian crown. George of Poděbrady acquired it in 1456; it returned to the crown in 1569 and passed to Prussia with Silesia in 1742.