_Bobone ORSINI ______+
                                             | (1048 - 1106)       
                        _Pietro ORSINI ______|
                       | (1075 - 1159)       |
                       |                     |_____________________
                       |                                           
 _Bobone ORSINI _______|
| (1100 - ....)        |
|                      |                      _____________________
|                      |                     |                     
|                      |_____________________|
|                                            |
|                                            |_____________________
|                                                                  
|
|--Orso ORSINI 
|  (1127 - 1207)
|                                             _____________________
|                                            |                     
|                       _____________________|
|                      |                     |
|                      |                     |_____________________
|                      |                                           
|_Crescenzio DI GAETA _|
                       |
                       |                      _____________________
                       |                     |                     
                       |_____________________|
                                             |
                                             |_____________________