The 11th Earl married Maud Camoys, and the earldom remained in their descendants until their great-grandson, Thomas Courtenay, 14th Earl of Devon, was beheaded at York on 3 April 1461 after the Battle of Towton, dying without issue.
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In the aftermath of the 1461 Battle of Towton remnants of the Lancastrian forces fleeing the victorious Yorkists were forced to try to cross the Cock Beck, having already disposed of most of their arms.
He had two brothers, John Neville, Baron Neville (c.1410-1461), who was slain at the Battle of Towton on 29 March 1461, and Sir Thomas Neville (died c. 1461) of Brancepeth, Durham, and one sister, Margaret, who married Sir William Lucy of Woodcroft, Bedfordshire.