_John I TRASTÁMARA ___+
                                                      | (1358 - 1390)         
                        _Ferdinand I TRASTÁMARA _____|
                       | (1380 - 1416)                |
                       |                              |_Eleanor of BARCELONA _+
                       |                                (1357 - 1382)         
 _John II TRASTÁMARA _|
| (1398 - 1478)        |
|                      |                               _Sancho Alfonso IVREA _+
|                      |                              | (1342 - 1373)         
|                      |_Eleanor of IVREA ____________|
|                        (1374 - 1435)                |
|                                                     |_Beatrice of BURGUNDY _+
|                                                       (1347 - 1381)         
|
|--Joanna of TRASTÁMARA 
|  (1455 - 1516)
|                                                      _Alonso ENRÍQUEZ _____+
|                                                     | (1354 - 1429)         
|                       _Fadrique ENRÍQUEZ __________|
|                      | (1390 - 1473)                |
|                      |                              |_Juana of MENDOZA _____
|                      |                                                      
|_Juana ENRÍQUEZ _____|
  (1425 - 1467)        |
                       |                               _______________________
                       |                              |                       
                       |_Mariana Fernández of AYALA _|
                         (1394 - 1431)                |
                                                      |_______________________