_Simon V of MONTFORT _______+
                                                     | (1170 - 1218)              
                              _Simon VI of MONTFORT _|
                             | (1208 - 1265)         |
                             |                       |_Alix of MONTMORENCY _______+
                             |                         (1170 - 1220)              
 _Guy of MONTFORT ___________|
| (1244 - 1291)              |
|                            |                        _John Lackland PLANTAGENET _+
|                            |                       | (1166 - 1216) m 1200       
|                            |_Eleanor PLANTAGENET __|
|                              (1215 - 1275)         |
|                                                    |_Isabella TAILLEFER ________+
|                                                      (1186 - 1246) m 1200       
|
|--Anastasia of MONTFORT 
|  (.... - 1306)
|                                                     ____________________________
|                                                    |                            
|                             _______________________|
|                            |                       |
|                            |                       |____________________________
|                            |                                                    
|_Margherita ALDOBRANDESCHI _|
  (1255 - 1313)              |
                             |                        ____________________________
                             |                       |                            
                             |_______________________|
                                                     |
                                                     |____________________________