Isaac Alfasi

Isaac Alfasi
Born1013
Qal'at Bani Hammad, now in Algeria
Died1103
Other namesRif
OccupationRabbi

Isaac ben Jacob Alfasi (1013–1103) (Arabic: إسحاق الفاسي, Hebrew: ר' יצחק אלפסי), also known as the Alfasi or by his Hebrew acronym, the Rif (Rabbi Isaac al-Fasi), was a Maghrebi 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.