Sir Hugh de Courtenay, 2nd/10th Earl of Devon, 2nd Baron Courtenay, feudal baron of Okehampton and feudal baron of Plympton, played an important role in the Hundred Years War in the service of King Edward III. His chief seats were Tiverton Castle and Okehampton Castle in Devon. The ordinal number given to the early Courtenay Earls of Devon depends on whether the earldom is deemed a new creation by the letters patent granted 22 February 1334/5 or whether it is deemed a restitution of the old dignity of the de Redvers family. Authorities differ in their opinions, and thus alternative ordinal numbers exist, given here.

Okehampton Castle is a medieval motte and bailey castle in Devon, England. It was built between 1068 and 1086 by Baldwin FitzGilbert following a revolt in Devon against Norman rule, and formed the centre of the Honour of Okehampton, guarding a crossing point across the West Okement River. It continued in use as a fortification until the late 13th century, when its owners, the de Courtenays, became the Earls of Devon. With their new wealth, they redeveloped the castle as a luxurious hunting lodge, building a new deer park that stretched out south from the castle, and constructing fashionable lodgings that exploited the views across the landscape. The de Courtenays prospered and the castle was further expanded to accommodate their growing household.