_Edward AVIZ ____________+
                                                    | (1391 - 1438)           
                         _Ferdinand AVIZ ___________|
                        | (1433 - 1470) m 1447      |
                        |                           |_Eleonor of TRASTÁMARA _+
                        |                             (1402 - 1444)           
 _Manuel I AVIZ ________|
| (1469 - 1521)         |
|                       |                            _John AVIZ ______________+
|                       |                           | (1399 - 1442)           
|                       |_Beatrice of AVIZ _________|
|                         (1430 - 1506) m 1447      |
|                                                   |_Isabella of BRAGANZA ___+
|                                                     (1402 - 1466)           
|
|--John III AVIZ 
|  (1502 - 1557)
|                                                    _John II TRASTÁMARA ____+
|                                                   | (1398 - 1478)           
|                        _Ferdinand II TRASTÁMARA _|
|                       | (1451 - 1515) m 1469      |
|                       |                           |_Juana ENRÍQUEZ ________+
|                       |                             (1425 - 1467)           
|_Maria of TRASTÁMARA _|
  (1482 - 1516)         |
                        |                            _John II TRASTÁMARA ____+
                        |                           | (1404 - 1454)           
                        |_Isabella I TRASTÁMARA ___|
                          (1451 - 1504) m 1469      |
                                                    |_Isabella of AVIZ _______+
                                                      (1428 - 1496)