Norman

The descent of Okehampton in the family of Baldwin fitzGilbert was as follows:^[3]

• Baldwin FitzGilbert (dead by Jan 1091), Sheriff of Devon. All three of his sons died successively without children.
• William FitzBaldwin (died 1096), son of Baldwin, died without children
• Robert FitzBaldwin (died 1101), brother of William, died without children
• Richard FitzBaldwin (died 1137), brother of Robert, Sheriff of Devon in 1096 and/or 1116,^{[citation needed]} died without children. He founded Brightley Priory^[4]

The ownership of Okehampton then becomes obscure for two decades,^[3] before it was held by a descendant of Baldwin fitzGilbert.

• Maud d'Avranches (died 1173), daughter and sole-heiress of Robert d'Avranches, who was son of William fitzWimund by a daughter of Baldwin fitzGilbert.^[5] She married firstly William de Curci (died pre 1162), by him having a daughter Hawise. As a widow, she would remarry to Robert FitzRoy (died 1172), a natural son of King Henry I of England. By her second husband Maud had a further daughter, Maud du Sap (died 1224). Maud du Sap, following her father's death, became a royal ward, and King Henry II married her to Reginald I de Courtenay (died 1190).
• Hawise de Curci (died 1219), daughter Maud by William de Curci, married the step-son of her half-sister, Reginald de Courtenay. Through this marriage, the barony came into the possession of the Courtenay family.

Courtenay

• Robert de Courtenay (died 1242), son of Reginald de Courtenay (died 1194) by his wife Hawise de Curci (died 1219), heiress of Okehampton. He married Mary de Vernon, daughter of William de Redvers, 5th Earl of Devon (died 1217), feudal baron of Plympton, Devon. From this marriage the Courtenays later inherited the barony of Plympton in 1293 and in 1335 were declared Earls of Devon.^[6]
• John de Courtenay (died 1274),^[7] (son) who married Isabel de Vere, daughter of Hugh de Vere, 4th Earl of Oxford (c. 1210 – 1263)
• Sir Hugh de Courtenay (died 1292),^[7] (son) who married Eleanor le Despenser (died 1328), daughter of Hugh le Despenser, 1st Earl of Winchester (1261–1326).
• Hugh Courtenay, 9th Earl of Devon (1276–1340),^[7] (son). In 1293 on the death of his cousin Isabella de Forz, Countess of Devon (1237–1293) (eldest daughter of Baldwin de Redvers, 6th Earl of Devon (1217–1245), feudal baron of Plympton in Devon^[8]) he became heir to the feudal barony of Plympton,^[8] and in 1335 was declared Earl of Devon. The descent of the feudal barony of Okehampton thenceforth follows the descent of the earldom of Devon.^[9] In 1539 King Henry VIII seized the lands of the barony and had Henry Courtenay, 1st Marquess of Exeter(died 1539) executed for treason.^[10] The Earldom of Devon became forfeit, and the Courtenay lands in Cornwall escheated (i.e. reverted) to the crown to be held by the Duchy of Cornwall.