Kohen Tzedek ben Abimai

Kohen Tzedek ben Abimai HaKohen (Hebrew: רב כהן צדק בן איבומאי הכהן; c. 816 – 848) was the Gaon of Sura from 832–843.

Biography
Kohen Tzedek was born in about 816. His father Rav Abimai was the Sura Gaon in 815 and a descendants of the Exilarchs. He was appointed to the Gaonate in 832, succeeding his great uncle Mesharsheya Kahana ben Jacob. Unlike many of his contemporaries, Kohen Tzedek spoke primarily in Hebrew as opposed to Aramaic. Several of his liturgical rulings are recorded by Isaac ibn Ghiyyat, and two of his responsa have been persevered. The first is in regards to circumcision. Kohen Tzedek reveals a respectful attitude toward local custom even when it diverges from the practice of the Babylonian academies. The other, is in regards to Shacharit (morning prayer). Kohen Tzedek states that when reading the Shema, one should add "אהבה רבה" (lit. great love) and in the Maariv prayer should add "אהבת עולם" (lit. love of the world). Kohen Tzedek died in 848 in Chamchamal and was succeeded by Sar Shalom ben Boaz.