Casimir I of Opole (Polish: Kazimierz I opolski) (c. 1179/80 – 13 May 1230) was a Duke of Opole-Racibórz from 1211 until his death.He was the eldest child and only son of Mieszko I Tanglefoot Duke of Opole-Racibórz and High Duke of Poland and his wife Ludmilla probably a Přemyslid princess.
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