Casimir I of Opole

Casimir I
Duke of Opole-Racibórz
Seal of Casimir I, 1226
Bornc. 1179/80
Died(1230-05-13)13 May 1230
BuriedCzarnowąsy monastery
Noble familySilesian Piasts
Spouse(s)Viola, Duchess of Opole
IssueMieszko II the Fat
Władysław
Wenzeslawa
Euphrosyne
FatherMieszko I Tanglefoot
MotherLudmilla

Casimir I of Opole (Polish: Kazimierz I opolski; c. 1178/79 – 13 May 1230), a member of the Piast dynasty, was a Silesian duke of Opole and Racibórz from 1211 until his death.