Additional royal grants followed during the final years of King Richard's reign. On 10 February 1398 Aumale was appointed Warden of the West March. On 11 August 1398 he was granted custody of the lands of Roger Mortimer, 4th Earl of March, during the latter's son's minority, and on 20 March 1399 lands which had lately belonged to John of Gaunt, 1st Duke of Lancaster, and which were part of the inheritance of his son, Henry Bolingbroke, the future King Henry IV.