Geneva Around this time, the House of Savoy came to at least nominally dominate the city. In the 15th century, an oligarchic republican government emerged with the creation of the Grand Council. In the first half of the 16th century, the Protestant Reformation reached the city, causing religious strife, during which Savoy rule was thrown off and Geneva allied itself with the Swiss Confederacy. In 1541, with Protestantism on the rise, John Calvin, the founder of Calvinism, became the spiritual leader of the city and established the Republic of Geneva. By the 18th century, Geneva had come under the influence of
History of Geneva strong faction within the city. The bishop still tried to exercise his jurisdiction over Geneva and on October 24, 1533 wrote a letter to the council, demanding it to stop Protestant preaching in Geneva, which the council refused to do. Following the bishop's flight, the influence of Protestant preachers in Geneva increased, and this was achieved to the chagrin of the local Catholic priests due to pressure from Bern, which threatened to revoke the 1526 alliance treaty unless freedom was granted to Protestants. In addition, the exiled bishop was gradually losing popularity also with the Catholic sections of Genevan society