Sir Thomas De Courtenay XIII Earl of Devon 1
- Born: Abt 1408, Topsham, Okehampton, Devon, England
- Marriage (1): Lady Margaret Beaufort Countess about 1431 in Devon, England
- Died: 3 Feb 1458, Abingdon, Berkshire, England about age 50
Thomas married Lady Margaret Beaufort Countess, daughter of John "Fairborn" Beaufort III, Knight of the Garter I Earl of Somerset and Lady Margaret Holland Countess Albermarle and Somerset Duchess Clarence Marquesses Dorset, about 1431 in Devon, England. (Lady Margaret Beaufort Countess was born in 1409 in Westminster, Middlesex, London, England and died in Nov 1449 in Colyton Church, Devon, Devonshire, England.)
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