נסים בן ראובן – Rabbeinu Nissim ben Reuven of Gerona, called RaN or RaNbaR. 14th century Catalonian physician and scholar. His most noted work is an extensive and exhaustive commentary on Hilkhot HaRif. Though the work only covers part of Hilkhot HaRif it is still considered an extremely important halakhic source, and is generally printed alongside it in modern editions of the Talmud.
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