Euphrosyne Piast of Opole was born circa 1229 to Casimir I of Opole (c1179-1230) and Viola Unknown (?-1251) and died 4 November 1292 of unspecified causes. She married Casimir I of Kuyavia (c1212-1267) 1257 JL . She married Mestwin II von Pommern (1220-1294) 1275 JL . Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Rollo of Normandy (860-932)/s.
|Offspring of Euphrosyne of Opole and Casimir I of Kuyavia (c1212-1267)|
|Władysław I the Elbow-high of Poland (1261-1333)||1261||2 March 1333||Hedwig of Poznań (1266-1339)|
|Casimir of Kuyavia (c1262-1294)|
|Siemowit of Kuyavia (c1265-c1311)|
|Euphemia of Kuyavia (c1266-1308)||1266||18 March 1308||Yuri I Lvovich of Halych (c1255-1308)|