Gershom Ben Judah

Gershom ben Judah, best known as Rabbeinu Gershom and also commonly known to scholars of Judaism by the title Rabbeinu Gershom Me'Or Hagolah, was a famous Talmudist and Halakhist. Rashi of Troyes said less than a century after Gershom's death, "all members of the Ashkenazi diaspora are students of his. "