Ilbert de Lacy III
- Born: 1106, Pontefract Castle, Yorkshire, England
- Marriage (1): Alice de Gaunt
- Died: 1141, Pontefract Castle, Yorkshire, England aged 35
- Buried: 1141, Pontefract Castle, Yorkshire, England
FamilySearch ID: KZYW-PP4.
Ilbert married Alice de Gaunt, daughter of Sir Walter de Gaunt 'Gant' Earl of Linsey and Matilda de Penthièvre. (Alice de Gaunt was born after 1120 in Folkingham, Lincolnshire, England, died in 1176 in Folkingham, Lincolnshire, England and was buried in Bardney Abbey, Bardney, West Lindsey District, Lincolnshire, England.)
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