2471. Jean I de29 Ponthieu (Guy II de30, Guillaume III Duke31 Alencon) was born about 1135. Jean died 1191 at age 56.

He married Beatrice de St pol before 1179. Beatrice was born about 1135. Beatrice was the daughter of Anselme de St pol and Eustache de Champagne.

Jean I de Ponthieu and Beatrice de St pol had the following child:

child + 2253 i. William Guillaume III28 Ponthieu was born 1179.

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