| Father | Fernando III Alfonsez CASTILE & LEON King (1201 - ) |
| Mother | Elisabeth Princess Of SWABIA (HOHENSTA [QUEEN OF CASTIL (1202 - 1235) |
| Sibling | Alfonso X "el CASTILE & LEON [KING OF THE GER (1221 - 1284) |
| Sibling | Fadrique Fernandez PRINCE CASTILE & LEON (1224 - 1277) |
| Sibling | Fernando Fernandez PRINCE CASTILE & LEON (1227 - 1243) |
| Sibling | Enrqiue Fernandez PRINCE CASTILE & LEON (1230 - 1304) |
| Sibling | Felipe Fernandez PRINCE CASTILE & LEON (1231 - 1274) |
| Sibling | Leonor Fernandez Princess CASTILE & LEON (1232 - ) |
| Sibling | Sancho Fernandez PRINCE CASTILE & LEON (1233 - 1261) |
| Sibling | Berenguela Fernandez Princess CASTILE & LEON (1234 - 1279) |
| Sibling | Maria Fernandez Princess CASTILE & LEON (1235 - 1235) |