John Calvin
Reform work commences (1536–1538)

In March 1536, Calvin published the first edition of his Institutio Christianae Religionis or Institutes of the Christian Religion. The work was an apologia or defense of his faith and a statement of the doctrinal position of the reformers. He also intended it to serve as an elementary instruction book for anyone interested in the Christian faith. The book was the first expression of his theology. Calvin updated the work and published new editions throughout his life. Shortly after its publication, he left Basel for Ferrara, Italy, where he briefly served as secretary to Princess Renée of France. By June he was back in Paris with his brother Antoine, who was resolving their father's affairs. Following the Edict of Coucy, which gave a limited six-month period for heretics to reconcile with the Catholic faith, Calvin decided that there was no future for him in France. In August he set off for Strasbourg, a free imperial city of the Holy Roman Empire and a refuge for reformers. Due to military maneuvers of imperial and French forces, he was forced to make a detour to the south, bringing him to Geneva. Calvin had intended to stay only a single night, but William Farel, a fellow French reformer residing in the city, implored him to stay and assist him in his work of reforming the church there. Calvin accepted his new role without any preconditions on his tasks or duties. The office to which he was initially assigned is unknown. He was eventually given the title of "reader", which most likely meant that he could give expository lectures on the Bible. Sometime in 1537 he was selected to be a "pastor" although he never received any pastoral consecration. For the first time, the lawyer-theologian took up pastoral duties such as baptisms, weddings, and church services.

During late 1536, Farel drafted a confession of faith, and Calvin wrote separate articles on reorganizing the church in Geneva. On 16 January 1537, Farel and Calvin presented their Articles concernant l'organisation de l'église et du culte à Genève (Articles on the Organization of the Church and its Worship at Geneva) to the city council. The document described the manner and frequency of their celebrations of the Eucharist, the reason for, and the method of, excommunication, the requirement to subscribe to the confession of faith, the use of congregational singing in the liturgy, and the revision of marriage laws. The council accepted the document on the same day.

As the year progressed, Calvin and Farel's reputation with the council began to suffer. The council was reluctant to enforce the subscription requirement, as only a few citizens had subscribed to their confession of faith. On 26 November, the two ministers hotly debated the council over the issue. Furthermore, France was taking an interest in forming an alliance with Geneva and as the two ministers were Frenchmen, councilors had begun to question their loyalty. Finally, a major ecclesiastical-political quarrel developed when the city of Bern, Geneva's ally in the reformation of the Swiss churches, proposed to introduce uniformity in the church ceremonies. One proposal required the use of unleavened bread for the Eucharist. The two ministers were unwilling to follow Bern's lead and delayed the use of such bread until a synod in Zurich could be convened to make the final decision. The council ordered Calvin and Farel to use unleavened bread for the Easter Eucharist. In protest, they refused to administer communion during the Easter service. This caused a riot during the service. The next day, the council told Farel and Calvin to leave Geneva.

Farel and Calvin then went to Bern and Zurich to plead their case. The resulting synod in Zurich placed most of the blame on Calvin for not being sympathetic enough toward the people of Geneva. It asked Bern to mediate with the aim of restoring the two ministers. The Geneva council refused to readmit the two men, who then took refuge in Basel. Subsequently, Farel received an invitation to lead the church in Neuchâtel. Calvin was invited to lead a church of French refugees in Strasbourg by that city's leading reformers, Martin Bucer and Wolfgang Capito. Initially, Calvin refused because Farel was not included in the invitation, but relented when Bucer appealed to him. By September 1538 Calvin had taken up his new position in Strasbourg, fully expecting that this time it would be permanent; a few months later, he applied for and was granted citizenship of the city.
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