THOMAS GREY, 1ST MARQUESS OF DORSET (145 I—I 50 0) , was the elder son of Sir John Grey, 7th Lord Ferrers of Groby (1432-61), by his wife, Elizabeth Woodville, afterwards queen of Edward IV. He fought for Edward at Tewkesbury; in he was created marquess of Dorset. After the death of Edward IV. Dorset and his brother, Richard Grey, supported their half brother, the young Edward V., thus incurring the enmity of Richard duke of Gloucester, afterwards Richard III. Richard Grey was arrested and beheaded at Pontefract in June 1483, while the marquess saved his life by flight. Dorset was one of the leaders of the duke of Buckingham's insurrection, and when this failed he joined Henry earl of Richmond in Brittany, but he was left in Paris when the future king crossed to England in 1485. After Henry's victory at Bosworth the marquess returned to England and his attainder was reversed, but he was suspected and impris oned when Lambert Simnel revolted; he had, however, been pardoned, had marched into France and had helped to quell the Cornish rising, when he died on Sept. 20, 1501.
Dorset's sixth son, Lord Leonard Grey (c. 1490-1541), went to Ireland as marshal of the English army in 1535, and in 1536 was appointed lord deputy in succession to Sir William Skeffing ton. He was accused, probably with truth, of favouring the family of the Geraldines, to whom he was related, and quarrelled fiercely with the rival family of the Butlers. Returning to England in 1S40 he was condemned to death for treason. He was beheaded on July 28, 1541. (See R. Bagwell, Ireland under the Tudors, vol. i., 1885.)