Rabbi Nissim ben Reuven (Ran)
(1320 - 1380)
Rabbi Nissim ben Reuven of Gerona was born in Barcelona.
Ran was considered the greatest Halachic authority of his generation, and queries were sent to him from throughout the Diaspora.
His closest disciple was Rivash. Ran's works include commentaries on the Talmud and on Alfasi's code, responsa, a recently published commentary on the Bible, and a collection of sermons
Sources: Orthodox Union