William Courtenay, 1st Earl of Devon
Arms of William Courtenay, 1st Earl of Devon (d. 1511) above the south porch of St Peter's Church, Tiverton (detail). The arms are Courtenay impaling the arms of his wife's father as Duke of York: Quarterly 1st: Royal arms of Lionel, Duke of Clarence; second and third, Elizabeth de Burgh, 4th Countess of Ulster; fourth, Edmund Mortimer, 3rd Earl of March
William Courtenay, 1st Earl of Devon (1475 – 9 June 1511), feudal baron of Okehampton and feudal baron of Plympton, was a member of the leading noble family of Devon. His principal seat was Tiverton Castle, Devon with further residences at Okehampton Castle and Colcombe Castle, also in that county.