_Orso ORSINI ________+
                                             | (1127 - 1207)       
                        _Giangaetano ORSINI _|
                       | (1154 - 1232)       |
                       |                     |_Gaetana DI GAETA ___
                       |                                           
 _Matteo Rosso ORSINI _|
|                      |
|                      |                      _____________________
|                      |                     |                     
|                      |_Oddo DI MONTICELLI _|
|                                            |
|                                            |_____________________
|                                                                  
|
|--Gentile I ORSINI 
|  (1200 - 1246)
|                                             _____________________
|                                            |                     
|                       _____________________|
|                      |                     |
|                      |                     |_____________________
|                      |                                           
|_Perna CAETANI _______|
                       |
                       |                      _____________________
                       |                     |                     
                       |_____________________|
                                             |
                                             |_____________________