John Calvin was a prominent theologian and reformer during the Protestant Reformation, known for his influential work in developing Reformed theology. Born in France in 1509, Calvin initially studied law but shifted his focus to theology following his conversion to Protestantism. His most significant contribution is the "Institutes of the Christian Religion," a systematic exposition of Christian doctrine that outlined his beliefs and interpretations of the Bible. Through this work, he established foundations for Reformed churches, emphasizing God's sovereignty and the concept of predestination. Calvin's influence extended beyond theology; he played a pivotal role in the governance of Geneva, turning it into a model Protestant city. He implemented strict moral codes and promoted education, believing in the importance of public literacy to understand the Scriptures. His efforts in Geneva attracted many Protestant refugees, turning the city into a center of Reformed thought and nurturing future reformers. Despite facing opposition and controversy, especially regarding his stance on predestination and religious tolerance, Calvin's ideas gained prominence across Europe. He had a profound impact on Protestantism, influencing various denominations and making lasting contributions to Christianity. His legacy continues to be felt in modern Reformed churches, where his teachings on grace and sovereignty remain central to their theology. John Calvin was a key figure in the Protestant Reformation, known for developing Reformed theology. He authored "Institutes of the Christian Religion," which laid the groundwork for Reformed churches. Calvin's governance of Geneva and his focus on education left a lasting impact on Protestant thought and practice.