The peace with France marked a crisis in the struggle between the rival Queens. It left Elizabeth secure against a Catholic rising and free to meet the pressure from the north. But it dashed the last hopes of Mary Stuart to the ground. The policy which she had pursued from her landing in Scotland had proved a failure in the end at which it aimed. Her religious toleration, her patience, her fair speeches, had failed to win from Elizabeth a promise of the succession. And meanwhile the Calvinism she hated was growing bolder and bolder about her. The strife of religion in France had woke a fiercer bigotry in the Scotch preachers. Knox had discovered her plans of reaction, had publicly denounced her designs of a Catholic marriage, and had met her angry tears, her threats of vengeance, with a cool defiance. All that Murray's policy seemed to have really done was to estrange from her the English Catholics. Already alienated from Mary by her connexion with France, which they still regarded as a half-heretic power, and by the hostility of Philip, in whom they trusted as a pure Catholic, the adherents of the older faith could hardly believe in the Queen's fidelity to their religion when they saw her abandoning Scotland to heresy and holding out hopes of her acceptance of the Anglican creed. Her presence had roused them to a new energy, and they were drifting more and more as the strife waxed warmer abroad to dreams of forcing on Elizabeth a Catholic successor. But as yet their hopes turned not so much to Mary Stuart as to the youth who stood next to the Scottish Queen in the line of blood. Henry Stuart, Lord Darnley, was a son of the Countess of Lennox, Margaret Douglas, a daughter of Margaret Tudor by her second marriage with the Earl of Angus. Lady Lennox was the successor whom Mary Tudor would willingly have chosen in her sister's stead, had Philip and the Parliament suffered her; and from the moment of Elizabeth's accession the Countess had schemed to drive her from the throne. She offered Philip to fly with her boy to the Low Countries and to serve as a pretender in his hands. She intrigued with the partizans of the old religion. Though the house of Lennox conformed to the new system of English worship, its sympathies were known to be Catholic, and the hopes of the Catholics wrapped themselves round its heir. "Should any disaster befall the Queen," wrote a Spanish ambassador in 1560, "the Catholics would choose Lord Darnley for King." "Not only," he adds in a later letter, "would all sides agree to choose him were the Queen to die, but the Catholic Lords, if opportunity offer, may declare for him at once." [Sidenote: Mary and Darnley.]