Another act of injustice and treachery on the part of Lord Grey (p. 095) drove Owyn to take the desperate step either of raising the standard of rebellion, or of joining his countrymen who had already raised it. Lord Grey withheld the letter of summons for the Welsh chief to attend the King in his expedition against Scotland, till it was too late for him to join the rendezvous. Owyn excused himself on the shortness of the notice; but Lord Grey reported him as disobedient. Aware that he had incurred the King's displeasure, and could expect no mercy, since his deadly foe had possession of the royal ear, Owyn put himself boldly at the head of his rebellious countrymen, who almost unanimously renounced their allegiance to the crown of England, and subsequently acknowledged Owyn as their sovereign lord. The Monk of Evesham, and the MS. Chronicle which used to be regarded as the compilation of one of Henry V.'s chaplains, both preserved in the British Museum, speak of the Welsh as having first risen in arms, and as having afterwards elected Owyn for their chief. It is, however, remarkable that no mention is made of Owyn Glyndowr in the King's proclamations, or any public document till the spring of 1401. Probably at first the proceedings, in which he took afterwards so (p. 096) pre-eminent a part, resembled riotous outrages, breaking forth in entire defiance of the law, but conducted neither on any preconcerted plan, nor under the direction of any one leader. Lord Grey's ancestors had received Ruthyn with a view to the protection of the frontier; and on the first indication of the rebellious spirit breaking out in acts of disorder and violence, both the King and the Prince wrote separately to Lord Grey, reminding him of his duty to disperse the rioters, and put down the insurgents. These mandates were despatched probably in the beginning of June 1400, some days before the King departed for the borders of Scotland. Lord Grey, in the letter[102] to which we have above referred, supposing that the (p. 097) King had already started on that expedition, returned an answer only to the Prince, acknowledging the receipt of his and his father's commands; but pleading the impossibility of executing them with effect, unless the Prince, with the advice of the King's council, would forward to him a commission with more ample powers, authorizing him to lay hands on the insurgents in whatever part of the country they might chance to be found; ordaining also that no lord's land should be respected as a sanctuary to shield them from the law; and that all the King's officers should be enjoined through the whole territory to aid and assist in quelling the insurrection.[103]