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Euphemia Piast of Poznań was born circa 1230 to Władysław Odonic of Poznań (c1190-1239) and Hedwig Unknown (?-1249) and died after 1281 of unspecified causes. She married Władysław of Opole (1225-1282) 1251 JL .
Children
| Name | Birth | Death | Joined with |
| Mieszko I of Cieszyn (c1254-1315) | 1254 | 1315 | |
| Casimir of Bytom (c1255-1312) | 1255 | 10 March 1312 | Helena |
| Bolko I of Opole (bef1258-1313) | 1258 | 14 May 1313 | Grzymisława (?-1286) Agnes von Brandenburg (c1260-bef1301) |
| Constance (c1260-c1287) | |||
| Przemysław of Racibórz (c1268-1306) | 12 June 1268 | 7 May 1306 | Anna of Masovia (1270-c1324) |
Residences