Janos Bolyai
From Conservapedia
János Bólyai (1802-1860) was a Hungarian mathematician. He was the son of Farkas Bolyai, another mathematician, who was a friend and colleague of the great German mathematician Carl Friedrich Gauss. János Bólyai invented non-Euclidean geometry at the same time as and independently of his rival, the Russian mathematician and astronomer Nikolai Lobachevsky. Non-Euclidean geometry is a form of geometry which differs from traditional Euclidean geometry in that it rejects Euclidean geometry's fifth postulate that parallel lines can never intersect.
