John Knox (1514-1572) was a Scottish clergyman and leader in the Protestant Reformation within Scotland. He was ordained as a priest in the Roman Catholic Church. However, he became a follower of the teachings of John Calvin and became a leader of the Scottish Reformation. He played a key role in establishing the Presbyterian Church in Scotland, and he wrote several influential works both in spiritual and political themes. Knox's teachings and actions were influential in shaping the Church of Scotland and the nation of Scotland, and he is regarded as one of the most important figures in Scottish history. Today, the Presbyterian Church remains the largest Protestant denomination in Scotland and has millions of followers around the world.