Karaite scholar; flourished in Egypt (or Babylonia) in the first half of the tenth century. According to Steinschneider, "Ḥasun" is a corrupted form of the Arabic name "Ḥusain," the ו being easily confounded in manuscript with the י Ḥasun, or, as he is generally quoted by the Karaite authorities, Ben Mashiaḥ, was a younger contemporary of Saadia Gaon, whom, according to Sahl ben Maẓliaḥ in his "Tokaḥat Megullah," he once challenged to a religious controversy. Ḥasun was the author of a polemical work, written probably in Arabic, in which he refuted one of Saadia's unpublished anti-Karaite writings, which came into his possession after the death of the author. Owing to a misunderstanding of a passage (§ 258) in the "Eshkol ha-Kofer" of Hadassi, Ḥasun was erroneously credited with the authorship of the anonymous chapter, on the theodicy, entitled "Sha'ar Ẓedeḳ" (St. Petersburg, Firkovich MSS. Nos. 683, 685), in the religio-philosophical work "Zikron ha-Datot," and of "Ḳuppat ha-Rokelim." Simḥah Isaac Luzki attributes to Ḥasun also a work on the precepts ("Sefer ha-Miẓwot"). Abraham ibn Ezra, in his introduction to the commentary on the Pentateuch, quotes a Karaite scholar named Ben Mashiaḥ, who is probably identical with Ḥasun.