_Giangaetano ORSINI _+
                                               | (1154 - 1232)       
                         _Matteo Rosso ORSINI _|
                        |                      |
                        |                      |_Oddo DI MONTICELLI _
                        |                                            
 _Gentile I ORSINI _____|
| (1200 - 1246)         |
|                       |                       _____________________
|                       |                      |                     
|                       |_Perna CAETANI _______|
|                                              |
|                                              |_____________________
|                                                                    
|
|--Bertoldo ORSINI 
|  (1220 - 1319)
|                                               _____________________
|                                              |                     
|                        ______________________|
|                       |                      |
|                       |                      |_____________________
|                       |                                            
|_Constanza of UNKNOWN _|
                        |
                        |                       _____________________
                        |                      |                     
                        |______________________|
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                                               |_____________________