While in exile, Knox was licensed to work in the Church of England, where he rose in the ranks to serve King Edward VI of England as a royal chaplain. He exerted a reforming influence on the text of the "Book of Common Prayer". In England, he met and married his first wife, Margery Bowes. When Mary I ascended the throne of England and re-established Roman Catholicism, Knox was forced to resign his position and leave the country. Knox moved to Geneva and then to Frankfurt. In Geneva, he met John Calvin, from whom he gained experience and knowledge of Reformed theology and Presbyterian polity. He created a new order of service, which was eventually adopted by the reformed church in Scotland. He left Geneva to head the English refugee church in Frankfurt but he was forced to leave over differences concerning the liturgy, thus ending his association with the Church of England.