John Knox was a Scottish minister, Reformed theologian, and writer who was a leader of the country's Reformation. He was the founder of the Presbyterian Church of Scotland.

Reformed Christianity, also called Calvinism, is a major branch of Protestantism that began during the sixteenth-century Protestant Reformation, a schism in the Western Church. In the modern day, it is largely represented by the Continental, Presbyterian, and Congregational traditions, as well as parts of the Anglican and Baptist traditions.