ר' יצחק סגי נהור

Isaac the Blind, was a French rabbi and a famous writer on Kabbalah. The Aramaic epithet "Saggi Nehor" means "of Much Light" in the sense of having excellent eyesight, an ironic euphemism for being blind. Some historians suspect him to be the author of the Book of the Bahir, an important early text of Kabbalah. Others characterize this view as an "erroneous and totally unfounded hypothesis".