_John I AVIZ ______________+
                                                | (1357 - 1433) m 1387      
                       _Edward AVIZ ____________|
                      | (1391 - 1438)           |
                      |                         |_Philippa of LANCASTER ____+
                      |                           (1360 - 1415) m 1387      
 _Ferdinand AVIZ _____|
| (1433 - 1470) m 1447|
|                     |                          _Ferdinand I TRASTÁMARA __+
|                     |                         | (1380 - 1416)             
|                     |_Eleonor of TRASTÁMARA _|
|                       (1402 - 1444)           |
|                                               |_Eleanor of IVREA _________+
|                                                 (1374 - 1435)             
|
|--Isabella of AVIZ 
|  (1459 - 1521)
|                                                _John I AVIZ ______________+
|                                               | (1357 - 1433) m 1387      
|                      _John AVIZ ______________|
|                     | (1399 - 1442)           |
|                     |                         |_Philippa of LANCASTER ____+
|                     |                           (1360 - 1415) m 1387      
|_Beatrice of AVIZ ___|
  (1430 - 1506) m 1447|
                      |                          _Afonso I BRAGANZA ________+
                      |                         | (1377 - 1461) m 1400      
                      |_Isabella of BRAGANZA ___|
                        (1402 - 1466)           |
                                                |_Beatriz PEREIRA DE ALVIM _
                                                  (1380 - 1414) m 1400