William I de Lancaster & Gundred de Warenne 
They had a son and a daughter, named William II and Avicia.
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Personal Details
William I de Lancaster
William I was born about 1115 in Kendal, Westmoreland, England. He died in 1170.
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Children
Avicia de Lancaster
Avicia was born about 1134 in Kendal, Westmoreland, England. She died on January 1st, 1191.
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