Hugh de Courtenay, 1st/9th Earl of Devon (14 September 1276 – 23 December 1340) was the son of Sir Hugh de Courtenay (died 1292), feudal baron of Okehampton in Devon, by his wife Eleanor le Despenser (died 1328), sister of Hugh le Despenser, 1st Earl of Winchester.
Forty-one years after the death of Isabel de Redvers, suo jure 8th Countess of Devon (died 1293) (eldest daughter of Baldwin de Redvers, 6th Earl of Devon), letters patent were granted by King Edward III of England, dated 22 February 1335, declaring him Earl of Devon, and stating that he 'should assume such title and style as his ancestors, Earls of Devon, had wont to do so'.
This thus made him 1st Earl of Devon, if the letters patent are deemed to have created a new peerage, otherwise 9th Earl of Devon, if it is deemed a restitution of the old dignity of the de Redvers family, and he is deemed to have succeeded the suo jure 8th Countess of Devon, his second-cousin once removed.
Authorities differ in their opinions, and thus alternative ordinal numbers exist for this Courtenay earldom.