In June Henry marched northward to end the trouble from the Scots. With their usual policy the Scottish army under the Duke of Albany withdrew as the English crossed the border, and looked coolly on while Henry invested the castle of Edinburgh. The wants of his army forced him in fact to raise the siege; but even success would have been fruitless, for he was recalled by trouble nearer home. Wales was in full revolt. The country had been devoted to Richard; and so notorious was its disaffection to the new line that when Henry's son knelt at his father's feet to receive a grant of the Principality a shrewd bystander murmured, "He must conquer it if he will have it." The death of the fallen king only added to the Welsh disquiet, for in spite of the public exhibition of his body he was believed to be still alive. Some hold that he had escaped to Scotland, and an impostor who took his name was long maintained at the Scottish Court. In Wales it was believed that he was still a prisoner in Chester Castle. But the trouble would have died away had it not been raised into revolt by the energy of Owen Glyndwr or Glendower. Owen was a descendant of one of the last native Princes, Llewelyn-ap-Jorwerth, and the lord of considerable estates in Merioneth. He had been squire of the body to Richard the Second, and had clung to him till he was seized at Flint. It was probably his known aversion from the revolution which had deposed his master that brought on him the hostility of Lord Grey of Ruthin, the stay of the Lancastrian cause in North Wales; and the same political ground may have existed for the refusal of the Parliament to listen to his prayer for redress and for the restoration of the lands which Grey had seized. But the refusal was embittered by words of insult; when the Bishop of St. Asaph warned them of Owen's power the lords retorted that "they cared not for barefoot knaves." They were soon to be made to care. At the close of 1400 Owen rose in revolt, burned the town of Ruthin, and took the title of Prince of Wales. [Sidenote: Owen Glyndwr]