Used as the Ferney Parish church up until the Notre-Dame et Saint-André church was built, this edifice - which was used for a time by the Protestants - was rebuilt by Voltaire and devoted to “the only God” (Deo Erexit Voltaire). A pyramid-shaped “half in, half out” tomb was added to it by Voltaire in 1766. (PNRHJ - Un tour en ville, “A tour of the town”)