 Despencer's greed and corruption became rampant and relations between him and the baronage disintegrated and resulted in the Despenser War of 1321–22, led by the Marcher Lords Roger Mortimer and Humphrey de Bohun.This culminated in the Battle of Boroughbridge on 16 March 1322 which was won by the King and Despencer and saw Gaveston's killer, Thomas, 2nd Earl of Lancaster (King Edward's cousin), himself executed.Some rebels were imprisoned such as Roger Mortimer (who escaped to France in August 1323) and Robert de Holland, 1st Baron Holand.