Camoys was the second son of Thomas de Camoys, 1st Baron Camoys and Elizabeth Mortimer. He was appointed a Knight before February 1427 and was in the English army that relieved the garrison at Calais in 1436. Roger was captured in 1444, by the French. He held the office of Seneschal of Gascony in July 1453, during the last stages of English Gascony. He promptly tried to rush reinforcements to Bordeaux, Libourne, Cadillac and Blanquefort. Camoys negotiated the surrender and safe conduct of the English and Gascon lords upon the capitulation of Bordeaux after a long siege. He was later sent to Calais as a prisoner during the Wars of the Roses, where he was executed in c. 1473. His armour was granted to the Earl of Salisbury.