Calvin was a theologian and a key figure during the Protestant Reformation. Calvin introduced new forms of Church government in the city of Geneva. Despite his eventual rule in Geneva in the years after 1555, Calvin faced opposition, such as that of Michael Servetus. Various factors contributed to Calvin's success, one of them was his ideas on the organization of the Church, although there were other important reasons, such as Calvin's theology, his leadership and his ability to defeat his opponents, thanks to his intelligence. First, Calvin's own emphasis in the Ecclesiastical Ordinances (EO) supports the idea that the organization of the Church was important. The passage of the EO was the condition for Calvin to assume spiritual control of Geneva. The EO established a ministry based on four offices; Pastors, Doctors, Deacons and Elders. The idea of ​​a strict Church was strengthened, through its disciplinary Consistory. After 1555 the Consistory gained the power to excommunicate. The EO created a clear and well-defined governance structure for a Protestant Church. This connects to the success of the Genevan Reformation, because without it Calvin would never have agreed to return from Strasbourg, as well as laying a solid foundation for the Reformation to take place. Subsequently, it was important that since 1541, the EO received the support of the City Council. This was reiterated during the events involving Philibert Berthelier in 1552 and 1553. Berthelier opposed Calvin's ecclesiastical rule and was part of the Ami Perrin clan, which opposed Calvin's strict laws on bans on singing and dancing, and later made part of another group. , with his brother, who opposed Calvin. Calvin wanted to assert the authority of the Co...... middle of paper...... social opponents. From 1541 to 1555 Calvin struggled with religious opponents. One such opponent was Bolsec in 1551, who denied transubstantiation. Calvin's doctrine of predestination was questionable, although in public debate Calvin's knowledge was superior and the Council agreed that Bolsec should be expelled. Calvin's intelligence and quick action meant that his opponents were quickly crushed; meaning that none of his enemies could sustain a substantial challenge, for a long period of time. This meant that none of Calvin's religious opponents were able to challenge his supremacy in Geneva. In conclusion, I think that Calvin's organization of the Church was very important to the success of Geneva, and although other factors contributed, the organization of the Church was the most effective, because of the Ecclesiastical Orders and institutions such as the Consistory.