Career

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."

He was the author of Sefer ha-Dinim which contains an account of his travels and those of other Jews in Eastern Europe. In this work, Przemyśl and Kiev are mentioned as trading sites along the Radhanite trade network.