John Knox (c. 1514 to 24 November 1572) was a Scottish clergyman and a leader of the Protestant Reformation who brought reformation to the church in Scotland. Influenced by early church reformers such as George Wishart, he joined the movement to reform the Scottish church. He was caught up in the ecclesiastical and political events that involved the murder of Cardinal Beaton in 1546 and the intervention of the regent of Scotland Mary of Guise. He was taken prisoner by French forces the following year and exiled to England on his release in 1549.
When Mary Tudor ascended the throne 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.
On his return to Scotland he led the Protestant Reformation in Scotland, in partnership with the Scottish Protestant nobility. The movement may be seen as a revolution, since it led to the ousting of Mary of Guise, who governed the country in the name of her young daughter Mary, Queen of Scots. Knox helped write the new confession of faith and the ecclesiastical order for the newly created reformed church, the Kirk.