Shortly after becoming King Bolingbroke knighted his sons and made his eldest son, Henry, the Prince of Wales. In August of 1400, although only around twelve years old, Henry accompanied the King first to the north of England where Robert III of Scotland was raiding the border country and then to Wales where Owain Glyndwr was in revolt. The king left Henry in Chester with the task of defeating Glyndwr. To help the young prince the king gave him Henry Percy more commonly known as Hotspur. Hotspur was a member of the Percy family from the north of England who had helped Bolingbroke become King. In 1401 Hotspur resigned his position due to lack of funds from the king and returned to the north to help his family fight the Scots. By 1403 Henry at the age of fifteen was in control of the army fighting the Welsh and in July of that year, when Hotspur and the Percys rebelled against the king, the prince fought at the king's side at the battle of Shrewsbury where Hotspur was killed. The conflict with the Welsh took up Henry's time until 1409 and the fall of Harlech Castle to the English.