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R. Isaac b. Eliakim of Posen (17th century), Yiddish moralist and author. R. Isaac was apparently attracted to Kabbalah. From Venice, R. Moses Zacuto sent him his treatise on the laws of writing Torah scrolls, Tikkun Soferim, for approval (Oxford, Bodleian Library, Ms. Opp. 554, which also contains R. Isaac's reply).