What did jhon calivn do that made him a reformer?

John Calvin was a key figure in the Protestant Reformation, known for his theological contributions that emphasized the sovereignty of God, predestination, and the authority of Scripture. He founded a distinct branch of Protestantism in Geneva, where he established a theocratic government and a system of church governance that influenced Reformed churches worldwide. His seminal work, "Institutes of the Christian Religion," laid the groundwork for Reformed theology and had a lasting impact on Christianity. Calvin's ideas promoted a more personal and direct relationship with God, moving away from the practices of the Catholic Church.