powerful opponent of King Richard II of England (ruled 1377–99).

The seventh son of King Edward III (ruled 1327–77), he was created Duke of Gloucester in 1385 and soon became the leader of a party opposed to Richard II, his young nephew. In 1386 Gloucester and his associates—later known as the appellants—took virtual control of the king's government. Gloucester defeated one of Richard's favourites, Robert de Vere, Duke of Ireland, at Radcot Bridge, Oxfordshire, in December 1387 and then had a number of the king's friends executed. In 1389 Richard gained the upper hand and worked out a compromise with his enemies. Gloucester was made lieutenant of Ireland in 1392, but in 1397 Richard arrested him and two other leading appellants. Committed to the charge of Thomas Mowbray, Earl of Nottingham (Norfolk, Thomas Mowbray, 1st Duke of, Earl Of Nottingham, Earl Marshal) (later Duke of Norfolk), at the English port of Calais, France, Gloucester was murdered, possibly on orders from Richard. According to one of Mowbray's servants, who was later executed for his part in the crime, the duke was suffocated with a feather bed.