"Henry Hotspur, a son of the Earl of Northumberland, was at that time Justice of North Wales and Constable of its chief castles. He was commanded by the King to take action forthwith, and accordingly in May, 1401 he proceeded to Dolgelly with a strong military force. At the foot of Cader Idris he met with the forces of Owain Glyndwr. A severe but undecided conflict took place, in which the followers of Glyndwr fully held their ground. Hotspur did not attempt to renew the attack, nor did he pursue Glyndwr farther, but quitted North Wales and resigned his offices of Justice and Constable." Source: Cambridge County Histories: Merionethshire, 1913; p.92-3.
B.A.Malaws, RCAHMW, 19 September 2006.