After his return from the brief but decisive expedition, to the success of which he had materially contributed, the Governor of the Castle was entrusted with the custody of some of the most important of the prisoners taken at Langside. A few months later, his steady adherence to the Regent brought him the double distinction of being raised to the dignity of Provost of Edinburgh, and of being not only denounced by the leaders of the faction which still looked upon the exiled Mary as the lawful sovereign, but actually ordered by them to constitute himself a prisoner, within twenty days, in the Castle of Dumbarton. When next he appeared as a prominent actor in the politics of the time, circumstances had worked startling changes in the respective positions of parties, and were already hurrying public men towards a momentous crisis, under the influence of which old ties were to be violently severed, and new sympathies and new aims were to bring former friends into bitter conflict with each other. The policy which Elizabeth had adopted from the moment when the Scottish Queen was in her power, and the discovery of her scheme for assuming the virtual management of Scottish affairs, after obtaining possession of the infant prince, had produced a strong revulsion in the feelings of many who had hitherto looked trustingly and hopefully towards England; and Murray’s popularity, already shaken by his severity towards Mary’s adherents, after the battle of Langside, sank lower and lower as proof after proof of his subserviency to the English Government was produced by his opponents. Those who, realising the difficulty of his position, and believing that he was as much the victim as the accomplice of the unscrupulous policy of Elizabeth and her astute minister, Cecil, were still inclined to give him credit for sincerity and honesty of purpose, felt their confidence in him die away when, to propitiate Elizabeth, he consented to the impeachment of Maitland. Amongst them was Kirkcaldy. At first, indeed, he could not bring himself to believe in the Regent’s responsibility for the step. Writing to Bedford, he confessed that he was unable to give a better or certain ground for the committing of Lethington to ward but the malice and envy of some of his enemies, who by means of a faction, had craftily induced the Regent to do that which he was most unwilling to do. He was assured, he said, that Murray in his heart sorely repented that ever he had yielded to their passions; and he felt no doubt that the trial would result in a declaration of the innocence of Lethington and the confusion of his enemies.