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                           |                                                    
 _Gian Galeazzo SFORZA ____|
| (1469 - 1494)            |
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|                                                                               
|
|--Bona SFORZA 
|  (1493 - 1557)
|                                                     _Ferdinand I TRASTÁMARA _+
|                                                    | (1423 - 1493)            
|                           _Alfonso II TRASTÁMARA _|
|                          | (1448 - 1495)           |
|                          |                         |_Isabella of CLERMONT ____
|                          |                           (1424 - 1465)            
|_Isabella of TRASTÁMARA _|
  (1470 - 1523)            |
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                           |                         |                          
                           |_Ippolita Maria SFORZA __|
                             (1446 - 1488)           |
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