Earl of Kent by right of his wife. He was a younger son. In 1340 he was in the expedition to Flanders, taking part in the battle of Sluys on June 24, and the siege of Tournai in July. He fought at Crecy on August 26, 1346, in the Prince's division, and after the battle superintended the counting of the slain. He took the count of Eu prisoner at the capture of Caen on July 26, 1346, but surrendered him to Edward III for 80,000 florins with the shield, June 16, 1347. During his absence abroad, his wife, Joan of Kent, went through a form of marriage (possibly under compulsion) with William Montagu, Earl of Salisbury. Thomas was a founder Knight of the Garter in 1348. On November 17, 1349, the Pope ordered Joan to be restored to him. He was summoned to Parliament from March 15, 1353/54, as Thome de Holand', whereby he is held to have become lord Holand. His wife may possibly be the lady in whose honor the Order of the Garter was named. On March 18, 1353, he was appointed lieutenant and captain in the duchy of Brittany. On June 6, 1356, he was appointed keeper of the Channel Islands. On November 20, 1360, he was summoned to Parliament as Thome Comiti Kanc'.