Rif

Yitzchak Alfasi, better known as the Rif, was a North African rabbi, talmudic commentator, and legal decisor. His most famous work is Hilkhot HaRif, a digest of talmudic discussions that omits the lengthy deliberations and focuses on the conclusions, followed by the Rif's decisions, which became widely authoritative and formed one of the pillars of the Shulchan Arukh. He is sometimes considered the last of the geonim, due to the great authority and reverence he enjoyed. His teacher was Rabbenu Chananel, and among his students were Yehuda Halevi and Joseph Ibn Migash.