Clarence, Lionel, duke of, 1338–68, third son of Edward III of England. His marriage (1352) to Elizabeth de Burgh gained him the title and lands of the earl of Ulster. Governor of Ireland from 1361 to 1367, he presided (1366) at the assembly where the notorious Statute of Kilkenny was adopted, forbidding marriage between the English settlers and the Irish. Clarence died soon after his later marriage to Violante Visconti. His daughter, Philippa, married Edmund Mortimer, 3d earl of March. Their granddaughter, Anne Mortimer, married Richard, earl of Cambridge, and their son, Richard, duke of York, derived his claim to the throne through his descent from Lionel.
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