High Quality Content by WIKIPEDIA articles! Henry of Grosmont, Duke of Lancaster(a) (c.1310 - 23 March 1361), also Earl of Derby and Leicester, was a member of the English nobility in the 14th century, and a prominent English diplomat, politician, and soldier. The son and heir of Henry Plantagenet, 3rd Earl of Lancaster and Maud Chaworth, he became one of Edward III's most trusted Captains in the early phases of the Hundred Years' War, and distinguished himself with victory in the Battle of Auberoche. He was a founding member of the Order of the Garter, and in 1351 was promoted to the title of duke. Grosmont was also the author of the book Livre de seyntz medicines; a highly personal devotional treatise. He is remembered as one of the founders and early patrons of Corpus Christi College, Cambridge, which was established by two of the guilds of the town in 1352.