John Knox was a Scottish clergyman and a leader of the Protestant Reformation in Scotland. He is best known for his role in establishing the Presbyterian Church of Scotland and for his influence on the Scottish Reformation. Knox was a powerful preacher and writer, and his ideas played a significant role in shaping the religious and political landscape of Scotland during the 16th century. He is often remembered as a key figure in the history of the Scottish Reformation and as a champion of Protestantism.