to England in January 1395, taking part in Richard II's expedition to Ireland, and was back in Aquitaine the following autumn. In the summer of 1396, he was again in Calais. Percy's military and diplomatic service brought him substantial marks of royal favour in the form of grants and appointments, but despite this, the Percy family decided to support Henry Bolingbroke, the future Henry IV, in his rebellion against Richard II. On Henry's return from exile in June 1399, Percy and his father joined his forces at Doncaster and marched south with them. After King Richard's deposition, Percy and his father were 'lavishly rewarded' with lands and offices. Under the new king, Percy had extensive civil and military responsibility in both the east march towards Wales, where he was appointed High Sheriff of Flintshire in 1399, and in the north toward Scotland. In north Wales, he was under increasing pressure as a result of the rebellion of Owain Glyndŵr. In March 1402, Henry IV appointed Percy royal lieutenant in north Wales, and on 14 September 1402, Percy, his father, and the Earl of Dunbar and March were victorious against a Scottish force at the Battle of Homildon Hill. Among others, they made a prisoner of Archibald Douglas, 4th Earl of Douglas. Rebellion, death and exhumation In spite of the favour that Henry IV showed the Percys in many respects, they became increasingly discontented with him. Among their grievances were: The king's failure to pay the wages due them for defending the Scottish border The king's favour towards Dunbar The king's demand that the Percys hand over their Scottish prisoners The king's failure to put an end to Owain Glyndŵr's rebellion through a negotiated settlement The king's increasing promotion of his son's (Prince Henry) military authority in Wales The king's failure to ransom Henry Percy's brother-in-law, Sir Edmund Mortimer, whom the Welsh had captured in June 1402 Spurred by these grievances, the Percys rebelled in the summer of 1403 and took up arms against the king. According to J. M. W. Bean, it is clear that the Percys were in collusion with Glyndŵr. On his return to England shortly after the victory at Homildon Hill, Henry Percy issued proclamations in Cheshire accusing the king of 'tyrannical government'. Joined by his uncle, Thomas Percy, Earl of Worcester, Percy marched to Shrewsbury, where he intended to do battle against a force there under