_Yves II BEAUMONT ____+
                                                       | (1040 - 1083)        
                            _Matthew I of BEAUMONT ____|
                           | (1079 - 1154)             |
                           |                           |_Adelaide of GOURNAY _
                           |                             (1055 - 1099)        
 _Matthew II of BEAUMONT __|
| (1110 - 1174)            |
|                          |                            ______________________
|                          |                           |                      
|                          |___________________________|
|                                                      |
|                                                      |______________________
|                                                                             
|
|--Matthew III of BEAUMONT 
|  (1129 - 1192)
|                                                       _Hugh IV CHÂTEAUDUN _+
|                                                      |                      
|                           _Geoffrey III CHÂTEAUDUN _|
|                          | (.... - 1145)             |
|                          |                           |_Agnes of FRÉTEVAL __
|                          |                                                  
|_Mathilde of CHÂTEAUDUN _|
  (.... - 1154)            |
                           |                            ______________________
                           |                           |                      
                           |_Helvise of MONDOUBLEAU ___|
                                                       |
                                                       |______________________