Aharon HaLevi
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Aaron ha-Levi of Barcelona (1235-c. 1290) (Hebrew: אהרן הלוי), known as the Ra'AH (the acronym for his Hebrew name), was a medieval rabbi, Talmudical scholar and Halakhist.
The Ra'ah was born in Gerona, Spain in 1235 to his father Rabbeinu Joseph ha-Levi, son of Rabbi Benbineshti ha-Levi, son of Rabbi Joseph ha-Levi, who was the son of Rabbeinu Zerachiah ha-Levi the Baal Hamaor. The Ra'ah's mother Klara, was a granddaughter of Rabbeinu Aaron of Lunel who was the son of Rabbeinu Meshullam of Lunel (Rabbeinu Meshullam hagodol)
The Ra'ah studied under his father Rabbeinu Joseph HaLevi and brother Rabeinu Pinchos HaLevi, as well as Nachmanides (Ramban). He published critical notes on the Rashba's Torat HaBayit, which he entitled Bedek HaBayith. He also wrote a commentary on the Talmud, select parts of which have been published. There are those who believe that he is the author of the anonymous Sefer ha-Chinuch, although this claim has been rejected by many scholars due to discrepancies between opinions expressed in Torat HaBayit and the Chinnuch. The Ritva was one of his students.