_Ferdinand I TRASTÁMARA _____+
                                                   | (1380 - 1416)                
                             _John II TRASTÁMARA _|
                            | (1398 - 1478)        |
                            |                      |_Eleanor of IVREA ____________+
                            |                        (1374 - 1435)                
 _Ferdinand II TRASTÁMARA _|
| (1451 - 1515) m 1469      |
|                           |                       _Fadrique ENRÍQUEZ __________+
|                           |                      | (1390 - 1473)                
|                           |_Juana ENRÍQUEZ _____|
|                             (1425 - 1467)        |
|                                                  |_Mariana Fernández of AYALA _
|                                                    (1394 - 1431)                
|
|--Maria of TRASTÁMARA 
|  (1482 - 1516)
|                                                   _Henry III TRASTÁMARA _______+
|                                                  | (1379 - 1406)                
|                            _John II TRASTÁMARA _|
|                           | (1404 - 1454)        |
|                           |                      |_Catherine of LANCASTER ______+
|                           |                        (1373 - 1418)                
|_Isabella I TRASTÁMARA ___|
  (1451 - 1504) m 1469      |
                            |                       _John AVIZ ___________________+
                            |                      | (1399 - 1442)                
                            |_Isabella of AVIZ ____|
                              (1428 - 1496)        |
                                                   |_Isabella of BRAGANZA ________+
                                                     (1402 - 1466)