Writing from exile in Geneva, John Knox described in detail what should be done at weekly worship in a 'Letter of Wholesome Councell' dated 1556. Protestant preachers fleeing Marian persecutions in England brought with them Edward VI's second Book of Common Prayer (of 1552), which was commended by the Lords of the Congregation. Knox too initially supported it (indeed reportedly, he had influenced aspects of it). However, before leaving Geneva and with the encouragement of John Calvin, he had written his own 'Book of Common Order' and it was this that was printed and approved by the General Assembly of 1562. Enlarged, it was reprinted with the Confession and the Psalms in metre in 1564, and it remained the standard until replaced with the Westminster Directory in 1643.