Cabalist; lived at Jerusalem in the seventeenth century. He, together with David Yi??a?i and Jacob Molko, was dayyan in the rabbinate of Moses Galante. A decision by ?ayyun concerning the dispute between Mordecai ha-Levi, chief rabbi of Cairo, and Judah ?abillo, rabbi of Alexandria, is published in the former's "Darke No'am" on the Shul?an 'Aruk, ?oshen Mishpa? (Nos. 47, 48). He was the author of a commentary on the Zohar, of which only a small part was published, under the title "Ma?aneh Aharon" (Leghorn, 1795).