Saadia Gaon

Saadia be Yosef carried the title Gaon, given to spiritual leaders of Babylonian Jewry. Saadia Gaon was head of the Sura yeshiva in Babylonia, and is considered to be the greatest scholar of his age. He translated the Bible into Arabic, standardized a prayer book for Jews living in the Arab world, and is best known for his philosophical explanation of Judaism, The Book of Belief and Opinions (Sefer Emunot ve-De'ot).