__
                                                                        |  
                             _de la Perche, Geoffrey II [-father of-] __|
                            |                                           |
                            |                                           |__
                            |                                              
 _Geoffrey II de la Perche _|
| (.... - 1100)             |
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|                           |___________________________________________|
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|                                                                          
|
|--Matilda de la Perche 
|  (.... - 1143)
|                                                                        __
|                                                                       |  
|                            _, Beatrice (of Montdidier) [-father of-] _|
|                           |                                           |
|                           |                                           |__
|                           |                                              
|_Beatrice _________________|
  (.... - 1129)             |
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                            |                                           |  
                            |___________________________________________|
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                                                                        |__