Lionel of Antwerp, 1st Duke of Clarence, jure uxoris 4th Earl of Ulster and 5th Baron of Connaught, KG (; 29 November 1338 – 7 October 1368) was the third son, but the second son to survive infancy, of Edward III of England and Philippa of Hainault. He was named for his birthplace, at Antwerp in Flanders. Prince Lionel was born of a Flemish mother and was a grandson of William I, Count of Hainaut. He grew to be nearly seven feet in height and had an athletic build.