_Gentile II ORSINI _________+
                                               | (1245 - 1318)              
                       _Romano ORSINI _________|
                      | (1273 - 1326)          |
                      |                        |____________________________
                      |                                                     
 _Roberto ORSINI _____|
| (1294 - 1344)       |
|                     |                         _Guy of MONTFORT ___________+
|                     |                        | (1244 - 1291)              
|                     |_Anastasia of MONTFORT _|
|                       (.... - 1306)          |
|                                              |_Margherita ALDOBRANDESCHI _
|                                                (1255 - 1313)              
|
|--Nicolo ORSINI 
|  (1331 - 1398)
|                                               ____________________________
|                                              |                            
|                      ________________________|
|                     |                        |
|                     |                        |____________________________
|                     |                                                     
|_Sibylle of BAUX ____|
  (.... - 1375)       |
                      |                         ____________________________
                      |                        |                            
                      |________________________|
                                               |
                                               |____________________________