_Geoffrey II CHÂTEAUDUN _+
                                                         | (1000 - 1045)            
                           _Fulk IV CHÂTEAUDUN _________|
                          | (1043 - 1109) m 1089         |
                          |                              |_Ermengarde of INGELGER __+
                          |                                (1017 - 1075)            
 _Fulk V CHÂTEAUDUN _____|
| (1089 - 1143) m 1110    |
|                         |                               _Simon I of MONTFORT _____+
|                         |                              | (1025 - 1087)            
|                         |_Bertrade of MONTFORT ________|
|                           (1070 - 1116) m 1089         |
|                                                        |_Agnes of ÉVREUX ________+
|                                                                                   
|
|--Elias II CHÂTEAUDUN 
|  (1111 - 1149)
|                                                         __________________________
|                                                        |                          
|                          _Elias I BAUGENCY ____________|
|                         | (.... - 1110) m 1090         |
|                         |                              |__________________________
|                         |                                                         
|_Ermengarde of BAUGENCY _|
  (1092 - 1125) m 1110    |
                          |                               __________________________
                          |                              |                          
                          |_Matilda of CHÂTEAU-DU-LOIR _|
                            (1055 - 1109) m 1090         |
                                                         |__________________________