_Gentile Virginio ORSINI _+
                                               | (1434 - 1496)            
                        _Gian Giordano ORSINI _|
                       | (1460 - 1517)         |
                       |                       |_Isabella of ORSINI ______+
                       |                                                  
 _Girolamo ORSINI _____|
|                      |
|                      |                        _Giuliano della ROVERE ___
|                      |                       | (1443 - 1512)            
|                      |_Felice della ROVERE __|
|                        (1483 - 1536)         |
|                                              |__________________________
|                                                                         
|
|--Paolo Giordano ORSINI 
|  (1541 - 1585)
|                                               __________________________
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|                       _______________________|
|                      |                       |
|                      |                       |__________________________
|                      |                                                  
|_Francesca of SFORZA _|
                       |
                       |                        __________________________
                       |                       |                          
                       |_______________________|
                                               |
                                               |__________________________