Levi ben Gershon, better known as Gersonides or the Ralbag, was a famous rabbi, philosopher, mathematician, astronomer/astrologer, and Talmudist. He was born at Bagnols in Languedoc, France. Wikipedia
The definitive Wikipedia entry for Gersonides. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Gersonides
