Henry of Grosmont, Duke of Lancaster

Henry of Grosmont (c. 1310–1361), only son of Henry, 3rd Earl of Lancaster, and Maud Chaworth, was Edward III's leading captain in the early Hundred Years' War. Created Earl of Derby in 1337, he won a victory at Auberoche in 1345.

He was a founding knight of the Order of the Garter in 1348 and in 1351 became Duke of Lancaster. He wrote Livre de Seyntz Medicines and died in 1361, leaving Maud and Blanche.