Moses Ben Maimon, commonly known as Maimonides and also referred to by the Hebrew acronym Rambam, was a Sephardic Jewish rabbi who is widely acknowledged as one of the most prolific and influential Torah scholars of the Middle Ages. April 6, 1135 – December 20, 1204; died at 69. Alive at the same time as Genghis Khan, Francis of Assisi, Averroes, Fibonacci, and Saladin. Wiki link