Pioneer of Non-Euclidean Geometry Giovanni Girolamo Saccheri (1667–1733) was an Italian Jesuit priest, philosopher, and mathematician whose work laid the groundwork for one of the most revolutionary ideas in mathematics: non-Euclidean geometry. Though largely overlooked during his lifetime, Saccheri’s exploration of alternatives to Euclid‘s parallel postulate would later inspire mathematicians such as Gauss, Bolyai, Lobachevsky, …








