Template:Wp-Thomas de Courtenay, 13th Earl of Devon

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Thomas de Courtenay, 5th/13th Earl of Devon (3 May 1414 – 3 February 1458) was a nobleman from South West England. His seat was at Colcombe Castle near Colyton, and later at the principal historic family seat of Tiverton Castle, after his mother's death. The Courtenay family had historically been an important one in the region, and the dominant force in the counties of Devon and Cornwall. However, the rise in power and influence of several gentry families and other political players, in the years leading up to Thomas' accession to the earldom, threatened the traditional dominance of the earls of Devon in the area. Much of his life was spent in armed territorial struggle against his near-neighbour, Sir William Bonville of Shute, at a time when central control over the provinces was weak. This feud forms part of the breakdown in law and order in England that led to the Wars of the Roses.

Courtenay was for a time engaged in overseas service during the Hundred Years' War. Increasingly, however, his efforts became directed towards strengthening his position at home. He had been married off as an infant to Margaret Beaufort, placing Courtenay close to the English king's Beaufort kinsmen. Due to this connection, Courtenay started his career as an adherent to the English court's Beaufort party. Upon their demise in the late 1440s, he abandoned it in favour of Richard Plantagenet, 3rd Duke of York. When York sought the support of Courtenay's arch-enemy Bonville, Courtenay fell out of favour with him. When the Wars of the Roses broke out, he was in the party of the queen, Margaret of Anjou, and was one of the Lancastrian commanders at the First Battle of St Albans, where he was wounded.

Courtenay was said to have promoted a reconciliation between the Lancastrian and Yorkist parties, but he died suddenly in 1458. The Wars of the Roses later led to the deaths and executions of all three of Courtenay's sons, Thomas, Henry, and John, and to the eventual attainder of his titles and forfeiture of his lands. The Earldom was however revived in 1485 for his distant cousin, Sir Edward Courtenay, third in descent from his great-uncle.