Rav Shmuel HaKohen bar Chofni, son-in-law of Rav Hai, was Rosh Yeshiva in Machsaya. He composed many books: the book of Sales and Purchases, the book of Boundaries, and others besides. He died in year 4794, five years before the passing of Rav Hai. [Tzemach David, (his burial is in Machsaya, Gedolei Yisrael), and see above year 2 and it requires examination. See Yuchsin, essay 5, in the later generations].