John Courtenay, 15th Earl of Devon
Sir John Courtenay was the third son of Thomas Courtenay, 13th Earl of Devon, and Margaret Beaufort, and was styled Earl of Devon by Lancastrians in exile, following the execution of his brother the 14th earl in 1461. Wikipedia
Born: 1435, England, United Kingdom
Died: May 4, 1471 (age 36 years), Tewkesbury, United Kingdom
Great-grandparents: John of Gaunt, Katherine Swynford, Alice Holland, Countess of Kent, and more