_Simon III of MONTFORT _____+
                                                     | (1117 - 1180) m 1148       
                        _Simon IV of MONTFORT _______|
                       | (1148 - 1188)               |
                       |                             |_Matilda of UNKNOWN ________
                       |                               (1129 - 1168) m 1148       
 _Simon V of MONTFORT _|
| (1170 - 1218)        |
|                      |                              _Robert III of BEAUMONT ____+
|                      |                             | (1135 - 1190)              
|                      |_Amicia of BEAUMONT _________|
|                        (1148 - 1215)               |
|                                                    |_Petronilla of GRANDMESNIL _
|                                                      (1123 - 1212)              
|
|--Petronilla of MONTFORT 
|  
|                                                     _Matthew I of MONTMORENCY __+
|                                                    | (1090 - 1160) m 1126       
|                       _Bouchard IV of MONTMORENCY _|
|                      | (1135 - 1189)               |
|                      |                             |_Alice FitzRoy of NORMANDY _+
|                      |                                m 1126                    
|_Alix of MONTMORENCY _|
  (1170 - 1220)        |
                       |                              _Baldwin IV FLANDERS _______+
                       |                             | (1108 - 1171)              
                       |_Lauretta of FLANDERS _______|
                         (1150 - 1181)               |
                                                     |_Adelaide of NAMUR _________+
                                                       (1124 - 1169)