See also
1. Margaret de Montdidier, daughter of Count Hildouin IV of Roucy and Montdidier (1020- ) and Countess Adela (Alix) of Roucy (c. 1026-1063), was born circa 1046 in Montdidier, Somme. She married Hugh de Clermont circa 1064.
Hugh de Clermont, son of Renaud de Clermont Creil (c. 1000- ), was born circa 1030 in Northampton. He died in 1101. He and Margaret de Montdidier had the following children:
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2. Adeliza de Clermont, daughter of Hugh de Clermont and Margaret de Montdidier, was born circa 1066.
3. Ermentrude de Clermont, daughter of Hugh de Clermont and Margaret de Montdidier, was born circa 1066. She married Hugh Lupus d'Avranches, Earl of Chester.
Hugh Lupus d'Avranches, Earl of Chester and Ermentrude de Clermont had the following children:
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4. Count Renaud II of Clermont, son of Hugh de Clermont and Margaret de Montdidier, was born circa 1108 in Clermont, Oise. He died in 1162 in Beauvaises. He married Clemence Bar.
Clemence Bar, daughter of Renaud de Bar (c. 1090- ) and Gisele de Vaudemont (c. 1095- ), was born circa 1122 in Dammartin, Ile-de-France. She and Count Renaud II of Clermont had the following children:
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5. Robert I FITZHUGH, son of Hugh Lupus d'Avranches, Earl of Chester and Ermentrude de Clermont, was born in 1110.
Robert I FITZHUGH had the following children:
| 7 | Robert II FITZHUGH (1134- ). Robert was born in 1134. |
6. Maud (Mahaut) de Ponthieu, daughter of Count Renaud II of Clermont and Clemence Bar, was born circa 1150 in Ponthieu, Ain, France. She died after October 1200. She married Count Aubrey II (Alberic) of Dammartin.
Count Aubrey II (Alberic) of Dammartin was born circa 1147 in Dammartin, Seine-et-Marne. He died on 19 September 1200. He was buried in Jumiege Abbey, Seine-Maritime. He and Maud (Mahaut) de Ponthieu had the following children:
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| 9 | Reynold le Simon de Dampmartin COUNT OF BOULOGNE AND PONTHIEU ( - ) |