1160 - 1235 ISAAC THE BLIND (Sagi Nahor) (France)
One of the early Kabbalists (see 1200). Although little is known about him, he was considered by many Kabbalists to be one of its great teachers. He lived in Posquieres and wrote a commentary on Sefer Yezira (the Book of Creation), an ancient text and one of the cornerstones of the Kabbalah. His students, Asher ben David and Azriel ben Menachem, moved to Gerona, which became a center of Kabbalistic study.