a leading adviser of King Edward I of England; he was treasurer of the exchequer from 1295 to 1307 and bishop of Lichfield from 1296 until his death. In both capacities he was greedy and unpopular.

From June 1296 to November 1297, Langton was in France and Flanders on diplomatic missions for Edward I. After Edward's death (July 7, 1307), Langton, whose enemies included Robert Winchelsey, archbishop of Canterbury, was dismissed by Edward II, with whom he had quarreled. His ecclesiastical holdings and revenues were seized, and he was imprisoned until January 1312.

He was released because Edward II wished to use him to undermine the strength of the lords ordainers, the committee of barons that attempted to reduce the power of the king and to rid the country of his favourite, Piers Gaveston. The barons, however, would not countenance Langton's reappointment as treasurer, and the king was forced to dismiss him from the privy council in 1315.