Not of a family of scholars, but an extremely wealthy merchant, he was elevated to the gaonate (presidency of a rabbinical academy) through the influence of his family. Caleb ibn Sargado, the determined opponent of Saadia, who spent 60,000 zuzim in order to bring about the deposition of the gaon of Sura, was probably identical with Aaron, as Harkavy has shown (see Seder 'Olam Zuṭṭa in "Anecdota Oxoniensia," ii. 83).
Four of Sargado's legal decisions on religious problems are preserved, and are printed in the collection, "Ḥemdah Genuza," Nos. 37-40. One of these, it appears, was the answer to an inquiry from Kairwan.
- Joel Müller, Mafteaḥ, 1891, p. 177;
- Adolf Neubauer, Mediœval Jew. Chron. i. 66, 92, 190;
- Zunz, in Geiger's Jüd. Zeit. iv. 389;
- Winter and Wünsche, Jüdische Literatur, ii. 247;
- Geiger, Jüd. Zeit. i. 297.