Guillaume III de Alencon 
Guillaume III was born about 1055. Guillaume III's father was Robert II De Alencon and his mother was Agnes De Ponthieu. His paternal grandparents were Roger De Montgomery and Mabel de Alencon; his maternal grandparents were Guy I de Ponthieu and Ada. He was an only child. He died in 1172.
They had a son named Guy II.
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Children
Guy II De Ponthieu
Guy II was born in Ponthieu, Somme, Picardy, France. He died in 1147 in Ephesus on his way to the Holy Land.
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