Robert de Courtenay gained the title of Lord of Sutton Courtenay [feudal baron].1 He gained the title of Lord of Okehampton [feudal baron].1 In 1215 he was granted the right to coin tin in Devon and Cornwall, by King John.1 On 31 July 1219 he inherited the great Honour of Okehampton from his mother, amounting to 92 kngihts' fees.1 He held the office of Castellan of Oxford.1 He held the office of Sheriff of Devon.1 He was Sheriff of Oxfordshire.1 He held the office of Castellan of Exeter.
He succeeded his uncle in Sutton Courtenay in 1209. Sheriff of Devon, Castellan of Exeter in England, in 1215. He was made responsible by King John for the minting of tin coin in Devon and Cornwall in 1215. He inherited from his mother the great Honor of Oakhampton, which amounted to 92 kingiht's fees, on 31 July 1219 in Devon, England. He married Mary de Vernon, daughter of William, 5th Earl of Devon and Mabirie de Beaumont-le-Roger, before 1230; Her 2nd (widow).