_________________________
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                        ________________________|
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                       |                                                  
 _William I LANCASTER _|
| (1100 - 1166) m 1155 |
|                      |                         _________________________
|                      |                        |                         
|                      |________________________|
|                                               |
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|                                                                         
|
|--William II LANCASTER 
|  (1154 - 1184)
|                                                _William I of WARENNE ___+
|                                               | (1035 - 1088) m 1070    
|                       _William II of WARENNE _|
|                      | (1071 - 1138)          |
|                      |                        |_Gundred of FLANDERS ____
|                      |                          (.... - 1085) m 1070    
|_Gundreda of WARENNE _|
  (1120 - 1166) m 1155 |
                       |                         _Hugh I CAPET ___________+
                       |                        | (1057 - 1101)           
                       |_Elizabeth of CAPET ____|
                         (1085 - 1130)          |
                                                |_Adelaide of HERBERTIAN _+
                                                  (1062 - 1120)