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Casimir I Piast of Opole, Duke of Racibórz, Duke of Opole, was born circa 1179 to Mieszko I Tanglefoot of Poland (c1130-1211) and Ludmilla Unknown (?-aft1210) and died 13 May 1230 of unspecified causes. He married Viola Unknown (?-1251) .
Children
| Name | Birth | Death | Joined with |
| Mieszko II the Fat of Opole (c1220-1246) | |||
| Władysław of Opole (1225-1282) | 1225 | 1282 | Euphemia of Poznań (c1230-aft1281) |
| Wenzeslawa of Opole (c1227-aft1230) | |||
| Euphrosyne of Opole (c1229-1292) | 1229 | 4 November 1292 | Casimir I of Kuyavia (c1212-1267) Mestwin II von Pommern (1220-1294) |
Residences
