Casimir I Piast of Kuyavia, Duke of Masovia, Duke of Kuyavia, Duke of Greater Poland, was born circa 1212 to Konrad of Poland (c1188-1247) and Agafia of Rus (c1192-c1248) and died 14 December 1267 of unspecified causes. He married Jadwiga Unknown (?-1235) . He married Constance of Poland (c1221-1257) 1239 JL . He married Euphrosyne of Opole (c1229-1292) 1257 JL . Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Rollo of Normandy (860-932)/s.


Offspring of Casimir I of Kuyavia and Constance of Poland (c1221-1257)
Name Birth Death Joined with
Adelaide of Kuyavia (bef1249-1291)
Leszek II the Black of Poland (c1241-1288) 1241 1288 Agrippina of Slavonia (c1248-c1307)
Ziemomysł of Kuyavia (c1243-1287) 1243 1287 Salome von Pommerellen (c1257-c1312)

Offspring of Casimir I of Kuyavia and Euphrosyne of Opole (c1229-1292)
Name Birth Death Joined with
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)



Footnotes (including sources)

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