a 3rd century Babylonian ʾ amora ʾ whose real name was ʾ Abba ben ʾ Aivu. “Rav” means “great” and is a tribute to the regard in which he was held by his students at the academy in Sura, which he founded. Rav and Mar Samuel are seen as the main teachers in the tradition that became the Babylonian Talmud. Rav's specialty was issues relating to religious law and interpretation.