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Abraham Abulafia (1240-1291) is one of the earliest kabbalists. Born in Spain, a student of the writings of Moses Maimonides and of Hillel, Abulafia wrote Sefer ha-Yashar (The Book of the Righteous), Sefer ha-Ot (The Book of the Sign), and Imre Shefer (Words of Beauty). Abulafia is closely associated with gematria, the symbolical employment of letters as numerals.
Abulafia is also the name of a word processor in Umberto Eco's Foucault's Pendulum.