_Ferdinand I TRASTÁMARA _____+
                                                    | (1380 - 1416)                
                            _Alfonso V TRASTÁMARA _|
                           | (1396 - 1458)          |
                           |                        |_Eleanor of IVREA ____________+
                           |                          (1374 - 1435)                
 _Ferdinand I TRASTÁMARA _|
| (1423 - 1493)            |
|                          |                         _Henry III TRASTÁMARA _______+
|                          |                        | (1379 - 1406)                
|                          |_Maria of TRASTÁMARA __|
|                            (1401 - 1458)          |
|                                                   |_Catherine of LANCASTER ______+
|                                                     (1373 - 1418)                
|
|--Joanna of TRASTÁMARA 
|  (1479 - 1518)
|                                                    _Ferdinand I TRASTÁMARA _____+
|                                                   | (1380 - 1416)                
|                           _John II TRASTÁMARA ___|
|                          | (1398 - 1478)          |
|                          |                        |_Eleanor of IVREA ____________+
|                          |                          (1374 - 1435)                
|_Joanna of TRASTÁMARA ___|
  (1455 - 1516)            |
                           |                         _Fadrique ENRÍQUEZ __________+
                           |                        | (1390 - 1473)                
                           |_Juana ENRÍQUEZ _______|
                             (1425 - 1467)          |
                                                    |_Mariana Fernández of AYALA _
                                                      (1394 - 1431)