John Knox was a Scottish minister and theologian who played a key role in the Protestant Reformation during the 16th century. He is best known for founding the Presbyterian Church in Scotland and for his strong opposition to Catholicism. Knox's teachings emphasized the authority of the Bible and the importance of a reformed church structure, which influenced many aspects of Scottish religious life. Born around 1514, Knox became a prominent figure in the movement for religious reform. He was a close associate of John Calvin and spent time in Geneva, where he developed his ideas on church governance. Knox's writings and sermons helped shape the religious landscape of Scotland, leading to the establishment of a distinct Protestant identity.