Euphrosyne Piast of Masovia was born circa 1293 to Boleslaus II of Masovia (c1251-1313) and Kunigunde of Bohemia (1265-1321) and died circa 1328 of unspecified causes. She married Władysław of Oświęcim (c1277-1324) 1304 JL . Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Hugh Capet (c940-996)/s, Rollo of Normandy (860-932)/s.
Children
| Offspring of Euphrosyne of Masovia and Władysław of Oświęcim (c1277-1324) | |||
| Name | Birth | Death | Joined with |
| Jan I of Oświęcim (c1309-1372) | 1309 | 29 September 1372 | Unknown Unknown Salome of Plauen (c1347-aft1400) |
| Anna of Oświęcim (?-1354) | |||
Residences
