ADRET, SHELOMOH BEN AVRAHAM (c. 1235–1310), known by the acronym RaSHBaʾ (Rabbi Shelomoh ben Avraham); Spanish rabbi and legal authority. Born into a leading family of Aragon, Adret studied with Yonah Gerondi and with the great Talmudist, biblical commentator, and qabbalist Moses Nahmanides (Mosheh ben Naḥman). During his four decades as rabbi of Barcelona, Adret was considered by the Aragonese kings to be the dominant Jewish figure in the realm.

Adret's scholarly reputation was established by his novellae (Heb., ḥiddushim) on many Talmudic tractates, and contemporaries recognized him as an outstanding authority on Jewish law. Rabbis of Aragon and of many distant countries submitted their formal legal inquiries to him, and his collected responsa, numbering in the thousands, made him one of the most prolific and influential of all Jewish legal respondents. An important source for the history of Jewish communal life...