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Eudoxia Piast of Masovia was born circa 1215 to Konrad of Poland (c1188-1247) and Agafia of Rus (c1192-c1248) and died 1240 of unspecified causes. She married Dietrich I. von Brehna (c1198-1266) .
Children
| Name | Birth | Death | Joined with |
| Otto III. von Brehna (?-1292) | |||
| Konrad I. von Brehna (?-1277) | |||
| Dietrich II. von Brehna | |||
| Heinrich von Brehna (?-1302) | |||
| Jutta von Brehna (c1235-1271) | 1235 | 1271 | Mestwin II. von Pommerellen (c1222-1294) |
| Hedwig von Brehna | |||
Residences