_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)            
|
|--Beatrice of TRASTÁMARA 
|  (1457 - 1508)
|                                                    __________________________
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|                           ________________________|
|                          |                        |
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|                          |                                                   
|_Isabella of CLERMONT ____|
  (1424 - 1465)            |
                           |                         __________________________
                           |                        |                          
                           |________________________|
                                                    |
                                                    |__________________________