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) . Charlemagne (747-814), Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Rollo of Normandy (860-932)/s.
|Offspring of Casimir I of Opole and Viola Unknown (?-1251)|
|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) Casimir I of Kuyavia (c1212-1267) Mestwin II von Pommern (1220-1294)|