Nissim of Gerona

Nissim ben Reuven (1290 – 9th of Shevat, 1376, Hebrew: נִסִּים בֶּן רְאוּבֵן) of Girona, Catalonia was an influential talmudist and authority on Jewish law. He was one of the last of the great Spanish medieval Talmudic scholars. He is also known by his Hebrew acronym, the RaN (ר"ן‎), or else with the definite article HaRaN (הר"ן‎), as well as by the name RaNbaR (רנב"ר‎), the Hebrew acronym of his full name, including his father's name, Reuven (ראובן‎),^[1] and also by Nissim Gerondi.