He was the son of Thomas de Beauchamp, 12th Earl of Warwick, and Margaret, daughter of the 3rd Lord Ferrers of Groby. Soon after reaching his majority and taking responsibility for the earldom in 1403, he had to defend against a Welsh invasion led by Owen Glendower, which he drove off.
Warwick acquired quite a reputation for chivalry, and when in 1408 he went on pilgrimage to the Holy Land, he was challenged many times to fight in the sporting combat which was then popular. On the return trip he went through Russia and Eastern Europe, not returning to England until 1410.
Once back he was asked to serve in the retinue of the Prince of Wales, and in 1413 was lord high steward at the prince's coronation as Henry V. The next year he helped put down the Lollard uprising, and then went to Normandy. He spent much of the next decade fighting the French in the Hundred Years War. In 1419 he was created Count of Aumale, part of the king's policy of giving out Norman titles to his nobles.
Henry V's will gave Warwick the responsibility for the education of the infant Henry VI. This duty required him to travel back and forth between England and Normandy many times. In 1437 the royal council deemed his duty complete, and he was appointed lieutenant of France and Normandy. He remained in France for the remaining two years of his life.
Warwick first married Elizabeth Berkeley, by whom he had 3 daughters: