principal authors of the Book of Common Prayer. Cox brought Knox's pamphlet attacking the emperor to the attention of the Frankfurt authorities, who advised that Knox leave. His departure from Frankfurt on 26 March 1555 marked his final breach with the Church of England. After his return to Geneva, Knox was chosen to be the minister at a new place of worship petitioned from Calvin. As such, he exerted an influence on French Protestants, whether they were exiled in Geneva or in France. In the meantime, Elizabeth Bowes wrote to Knox, asking him to return to Margery in Scotland, which he did at the end of August. Despite initial doubts about the state of the Reformation in Scotland, Knox found the country significantly changed since he was carried off in the galley in 1547. When he toured various parts of Scotland preaching the reformed doctrines and liturgy, he was welcomed by many of the nobility including two future regents of Scotland, the Earl of Moray and the Earl of Mar. Though the Queen Regent, Mary of Guise, made no move against Knox, his activities caused concern among the church authorities. The bishops of Scotland viewed him as a threat to their authority and summoned him to appear in Edinburgh on 15 May 1556. He was accompanied to the trial by so many influential persons that the bishops decided to call the hearing off. Knox was now free to preach openly in Edinburgh. William Keith, the Earl Marischal, was impressed and urged Knox to write to the Queen Regent. Knox's unusually respectful letter urged her to support the Reformation and overthrow the church hierarchy. Queen Mary took the letter as a joke and ignored it. Return to Geneva, 1556–1559 Shortly after Knox sent the letter to the Queen Regent, he suddenly announced that he felt his duty was to return to Geneva. In the previous year on 1 November 1555, the congregation in Geneva had elected Knox as their minister and he decided to take up the post. He wrote a final letter of advice to his supporters and left Scotland with his wife and mother-in-law. He arrived in Geneva on 13 September 1556. For the next two years, he lived a happy life in Geneva. He recommended Geneva to his friends in England as the best place of asylum for Protestants. In one letter he wrote: I neither fear nor