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 icons on one hand and to prohibit the celebration of Mass on the other. This move increased further the flight of Catholics from the city into Savoy territories. Following another unsuccessful invasion of Geneva by Savoy forces in October 1535, which ended in a Savoy defeat at Gingins, the Grand Council decided on February 3, 1536 on the destruction of all castles around Geneva in order not to allow any princes another pretext for invading their city. On May 21, 1536, the Genevans declared themselves Protestant by taking a public oath of allegiance to the Lutheran faith where all residents