Constance Piast of Poland was born circa 1221 to Henry II the Pious of Poland (c1196-1241) and Anne of Bohemia (1204-1265) and died 23 February 1257 of unspecified causes. She married Casimir I of Kuyavia (c1212-1267) 1239 JL . Charlemagne (747-814), Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Hugh Capet (c940-996)/s, Rollo of Normandy (860-932)/s.
|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)|