Dorset's sixth son, Lord Leonard Grey (c. 1490-1541), went to Ireland as marshal of the English army in 1535, being created an Irish peer as Viscount Grane in the same year, but he never assumed this title. In 1536 Grey was appointed lord deputy of Ireland in succession to Sir William Skeffington; he was active in marching against the rebels and he presided over the important parliament of 1536, but he was soon at variance with the powerful family of the Butlers and with some of the privy councillors.
He did not relax his energy in seeking to restore order, but he was accused, probably with truth, of favouring the family of the Geraldines, to whom he was related, and the quarrel with the Butlers became fiercer than ever. Returning to England in 1540 he was thrown into prison and was condemned to death for treason. He was beheaded on the 28th of July 1541 (see R. Bagwell, _Ireland under the Tudors_, vol. i., 1885).
THOMAS GREY, 2ND MARQUESS OF DORSET (1477-1530), the eldest son of the 1st marquess, fled to Brittany with his father in 1484; after receiving several marks of the royal favour and succeeding to the title, he was imprisoned by Henry VII., and remained in prison until 1509. He was on very good terms with Henry VIII., who in 1512 appointed him to command the English army which was to invade France in conjunction with the Spanish forces under Ferdinand of Aragon. In spite of the failure which attended this enterprise, Dorset again served in France in the following year, and in 1516 he was made lieutenant of the order of the Garter. Later he was at the Field of the Cloth of Gold, and he was warden of the eastern and middle marches towards Scotland in 1523 and the following years. He received many other positions of trust and profit from the king, and he helped to bring about the fall of Cardinal Wolsey, under whom he had probably been educated. He was famous for his skill in the tournament. He died on the 10th of October 1530.
His eldest son Henry Grey, 3rd marquess of Dorset, was in 1551 created duke of Suffolk (q.v.). A younger son, Lord Thomas Grey, was beheaded in April 1554 for sharing in the rebellion of Sir Thomas Wyat; another son, Lord John Grey, was also sentenced to death for his share in this rising, but his life was spared owing to the efforts of his wife Mary, daughter of Sir Anthony Browne. Under Elizabeth, Lord John, a strong Protestant, was restored to the royal favour, and he died on the 19th of November 1569. In 1603 his son Henry (d. 1614) was created Baron Grey of Groby, and in 1628 his great-grandson Henry was made earl of Stamford.