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Talmudist and posek.wd:Q523491
Isaac ben Jacob Alfasi ha-Cohen (1013–1103) (Hebrew: ר' יצחק אלפסי, Arabic: إسحاق الفاسي) - also known as the Alfasi or by his Hebrew acronym Rif (Rabbi Isaac al-Fasi), was an Algerian Talmudist and posek (decider in matters of halakha - Jewish law). He is best known for his work of halakha, the legal code Sefer Ha-halachot, considered the first fundamental work in halakhic literature. His name "Alfasi" means "of Fez" in Arabic, but opinions differ as to whether he ever lived in Fez.
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