The result of his studies was "Etz HaChayyim" ("Tree of Life"; 1346), a philosophical work modeled after Maimonides' own "Moreh Nevuchim" ("Guide to the Perplexed"). In fact, one of the chief criticisms of the work is that it attempts to imitate Maimonides' "Guide" far too slavishly, in terms of both structure and style. In 1354, while living in Constantinople, he composed his second major work, "Gan Eden" ("The Garden of Eden"), about the commandments of the Bible and an attempt to defend the Karaite legal code and in 1362 he wrote "Keter Torah" ("Crown of the Torah"), a comprehensive commentary on the Pentateuch using a literal interpretation of the writings. He died in Constantinople, Byzantine Empire.