Johannes Müller von Königsberg, better known as Regiomontanus, was a mathematician, astrologer and astronomer of the German Renaissance, active in Vienna, Buda and Nuremberg. His contributions were instrumental in the development of Copernican heliocentrism in the decades following his death. June 15, 1436 – July 15, 1476; died at 40. Alive at the same time as Christopher Columbus, Mehmed II, François Villon, Pius II, and Nicholas of Cusa. Wiki link