Yehudai Gaon

Yehudai ben Nachman Gaon, head of the academy of Sura in Babylonia during the mid-eighth century, is credited with one of the very first attempts to turn the Talmud into a usable law book. Instead of leaving practical rulings buried inside the Talmud's sprawling debates, he gathered and arranged them so that scholars could simply look up the answer. He led during the Geonic period, a transformative era when Jewish communities across the diaspora increasingly turned to the Geonim of Babylonia for guidance on questions of Jewish law. Renowned for deriving clear conclusions from the Talmud, he sent rulings that reached distant communities and shaped the development of Ashkenazi Judaism. Much of his written work survives only in fragments and in quotations by later authorities, yet his influence on the Jewish law of later generations was lasting.