1326 - 1408 ISAAC BEN SHESHET PERFET (the Rivash) (Spain)
Rabbi, Halachic Authority and communal leader. Though he actually studied under the Ran, he is considered a pupil of ben Aderet whose teachings he followed. He wrote commentaries on the Talmud, Bible and Halachah, with many of his 518 responsa published as She'elot u-Teshuvot ha-Ribash. He was arrested and held along with his brother Judah, R.Nissim Gerondi and R. Hasdai Crescas and others on false charges of host desecration but eventual cleared. Perfet then served as rabbi of Sarargossa. He is also remembered for his uncompromising defense of Jewish tradition, even attacking those of the “ruling class” which often led him into conflict.