Percy and his son, Henry Percy, known…

Percy and his son, Henry Percy, known as "Hotspur", have been given the task of subduing the rebellion of Owain Glydwyr but their attempts to make peace with the Welsh rebels have not meet with the king's approval.

After King Henry IV improperly and illegally claims the captured Earl of Douglas and the right to ransom in 1403, the angered Percys turn against Henry in favor of Edmund de Mortimer, 5th Earl of March, who has a rightful claim to the English throne, and conspire with Glyndwyr.