The Zohar (, Zōhar, lit. "Splendor" or "Radiance") is a foundational work in the literature of Jewish mystical thought known as Kabbalah. It is a group of books including commentary on the mystical aspects of the Torah (the five books of Moses) and scriptural interpretations as well as material on mysticism, mythical cosmogony, and mystical psychology. The Zohar contains discussions of the nature of God, the origin and structure of the universe, the nature of souls, redemption, the relationship of Ego to Darkness and "true self" to "The Light of God". The Zohar was first publicized by Moses de León (c. 1240 – 1305 CE), who claimed it was a Tannaitic work recording the teachings of Simeon ben Yochai (). This claim is universally rejected by modern scholars, most of whom believe de León, also an infamous forger of Geonic material, wrote the book himself between 1280 and 1286. Some scholars argue that the Zohar is the work of multiple medieval authors and/or contains a small amount of genuinely antique novel material. Later additions to the Zohar, including the Tiqqune hazZohar and the Ra'ya Mehimna, were composed by a 14th century imitator. Language According to Gershom Scholem and other modern scholars, Zoharic Aramaic is an artificial dialect largely based on a linguistic fusion of the Babylonian Talmud and Targum Onkelos, but confused by de León's simple and imperfect grammar, his limited vocabulary, and his reliance on loanwords, including from contemporaneous medieval languages. Authorship Initial view Authorship of the Zohar was questioned from the outset, due to the claim that it was discovered by one person and referred to historical events of the post-Talmudic period while purporting to be from an earlier date. Abraham Zacuto's 1504 work Sefer Yuhasin (first printed 1566) quotes from the Kabbalist Isaac ben Samuel of Acre's 13th century memoir Divre hayYamim (lost), which claims that the widow and daughter of de León revealed that he had written it himself and only ascribed the authorship to Simeon ben Yochai for personal profit: Isaac goes on to say that he obtained mixed evidence of Zohar's authenticity from other Spanish Kabbalists, and, though he treats it as genuine in his Otzar haChayyim, he rarely quotes it. Isaac's testimony was censored from the second edition (1580) and remained absent from all editions thereafter until its restoration nearly 300 years later in the 1857 edition. Within fifty years of its appearance