His fame as an eloquent preacher, and able and ready defender of the doctrines of the Reformation, spread southwards; and at the close of 1551, or early in 1552, he was appointed one of the royal chaplains of Edward VI. In the autumn of 1552 he was summoned to the south, and preached with great power and faithfulness before the king and his court. He persistently advocated, along with the other royal chaplains, those thoroughgoing Protestant doctrines which, in the north, he had previously held and taught and carried out in practice. In conjunction with the other five royal chaplains, he was called to give his opinion of the Articles then proposed to be adopted as the creed of the English Church, and of the revised Communion Office then prepared to take the place of that of 1549. His objections to the act of kneeling in receiving the elements in the Lord's Supper helped to procure the insertion of that rubric which high-churchmen term "the black rubric." He refused both an English bishopric and a London rectory, and continued to labour on, faithfully and devotedly, as a preacher unattached. He had a presentiment that the time he would have to do so would be brief, and he improved it to the uttermost. The Reformation in England at that date had been forced on by its courtly patrons and their earnest preachers beyond what was warranted by the hold it had as yet gained on the mass of the people. When the good King Edward[91] was succeeded by the bigoted Mary, nothing remained for the Protestant bishops and preachers but either to prove the sincerity of their convictions in prison and at the stake, or to leave the country and reserve themselves in exile for happier times. Knox, as a foreigner, was especially warranted to choose the latter course; and at the urgent request of his friends in the north he did so, when it was only not yet too late to escape. [Sidenote: Visits Scotland.]