John Dawney's elder brother, Thomas Dawney of Escrick, Yorkshire, married Elizabeth, the daughter of John Newton of Snaith, Yorkshire, and was ancestor of the Viscounts Downe.
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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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All his honours were forfeited by attainder, and the earldom eventually passed, after a brief period of confusion during the Wars of the Roses (for which see Earl of Devon), by a new creation in 1485 to Edward Courtenay, 1st Earl of Devon (d.1509), the grandson of Sir Hugh Courtenay of Haccombe and Bampton (1358–1425), brother of the 11th Earl.
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