Josiah ben Saul ( Hebrew: יאשיהו בן שאול) was the grandson of Anan ben David and a Karaite Nasi. Some of his halakhic opinions are quoted by later Karaite scholars. [1][ unreliable source?] He was the father of Jehoshaphat and Semah, who both functioned as leaders of the Palestinian Gaonate. [2]