_Orso ORSINI ________+
                                                   |                     
                             _Girodano ORSINI _____|
                            |                      |
                            |                      |_____________________
                            |                                            
 _Francesco ORSINI _________|
| (1353 - 1404)             |
|                           |                       _Roberto ORSINI _____+
|                           |                      | (1294 - 1344)       
|                           |_Anastasia of ORSINI _|
|                             (1333 - 1353)        |
|                                                  |_Sibylle of BAUX ____
|                                                    (.... - 1375)       
|
|--Orso ORSINI 
|  (1372 - 1424)
|                                                   _____________________
|                                                  |                     
|                            ______________________|
|                           |                      |
|                           |                      |_____________________
|                           |                                            
|_Constanza ALDOBRANDESCHI _|
  (1358 - ....)             |
                            |                       _____________________
                            |                      |                     
                            |______________________|
                                                   |
                                                   |_____________________