Sir William le Boteler, 7th Baron Warrington
- Born: Abt 1231, Warrington, Lancashire, England
- Marriage (1): Dionysia de Lostock about 1248 in Warrington, Lancashire, England
- Died: 1303, Caerlaverock Castle, Dumfriesshire, Scotland aged about 72
- Buried: 1303, Warrington, Lancashire, England
FamilySearch ID: L627-LYJ.
William married Dionysia de Lostock, daughter of Sir Henry de Lostock and Joanna de Lancashire, about 1248 in Warrington, Lancashire, England. (Dionysia de Lostock was born in 1234 in Lostock, Lancashire, England, died in 1290 in Warrington, Lancashire, England and was buried in 1290 in Warrington, Lancashire, England.)
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