Yehuda ben Meir
(also known as Yehuda ha-Kohen
or Judah of Mainz
was a German-Jewish rabbi
scholar and traveler of the late tenth and early eleventh century CE. His book Sefer ha-Dinim
contains an account of his travels and those of other Jews in Eastern Europe. In this work, Przemyśl
are mentioned as trading sites along the Radhanite
Rabbi Yehuda was the principal teacher of Gershom ben Judah, and his work was highly influential on the later writings of Rashi. Yehuda was surnamed, according to some sources, either "Léon", "Léonṭe", "Léonṭin", "Sire Léon", and "Sire Léonṭin", and was designated as "the grand" and "the gaon."