William I de Lancaster
- Born: Abt 1117, Cumberland, England
- Marriage (1): Gundred de Warenne
- Marriage (2): William I de Lancaster second wife about 1139 in England
- Died: 1135, Westmorland, England aged about 18
FamilySearch ID: LCJ8-3W9.
William married Gundred de Warenne, daughter of William de Warenne II and Countess of Leicester Elizabeth de Vermandois. (Gundred de Warenne was born about 1120 in England and died in 1170 in Kendal, Westmorland, England.)
William next married William I de Lancaster second wife about 1139 in England. (William I de Lancaster second wife was born about 1120.)
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