Family: William Guillaume III Ponthieu / Alix Princess of France (F2356)
m. 20 Aug 1195Jean I de Ponthieu (1135-1191) 
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Beatrice de St pol (1135- )
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| Louis VII King of France (1120-1180)
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| Alice, Countess of Champagne (1140-1206)
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Agnes Anna , France (1171-1240)  |
| William Guillaume III Ponthieu (1179-1221)
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| Alix Princess of France (1170-1221)
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| Marie Countess of Ponthieu (1186-1251) |