Sir Robert De Willoughby, 1st Baron Willoughby d'Eresby
- Born: Abt 1271, Eresby, Spilsby, Lincolnshire, England
- Marriage (1): Margaret Deincourt about 1298 in Lincolnshire, England
- Died: 25 Mar 1316, Eresby, Spilsby, Lincolnshire, England aged about 45
FamilySearch ID: LC5P-ZCK.
Robert married Margaret Deincourt, daughter of Edmund Deincourt and Isabel de Mohun, about 1298 in Lincolnshire, England. (Margaret Deincourt was born in 1275 in Blankney, Lincolnshire, England, died on 18 Oct 1333 in Eresby, Spilsby, Lincolnshire, England and was buried in Oct 1333 in Lincolnshire, England.)
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