Duchy of Silesia
The Duchy of Opole and Racibórz (, ) was one of the numerous Duchies of Silesia ruled by the Silesian branch of the royal Polish Piast dynasty. It was formed in 1202 from the union of the Upper Silesian duchies of Opole and the Racibórz, in a rare exception to the continuing feudal fragmentation of the original Duchy of Silesia.