ר׳ משה בן שם טוב די ליאון

ר׳ משה בן שם טוב די ליאון (c.1240–1305) was a Castilian kabbalist whose writings transformed Jewish mystical literature. His birthplace is uncertain: León and Guadalajara are both proposed, and the family name may have been inherited. A 1264 manuscript copied for him provides an early documentary trace. He lived and wrote in Guadalajara from at least 1286 to 1293, later moving among Castilian towns including Valladolid and Ávila. In Hebrew works such as ספר הרימון, הנפש החכמה, שקל הקודש, and משכן העדות, he developed a symbolic theosophy closely related to the Aramaic material he circulated as the זוהר. Traditional attribution presents the Zohar as teachings of ר׳ שמעון בר יוחאי transmitted from an ancient manuscript; modern scholarship generally understands its central strata as a late-thirteenth-century Castilian composition associated especially with ר׳ משה די ליאון, while continuing to debate sources, layers, and collaborators. He died unexpectedly in Arévalo in 1305 while returning toward his home in Ávila. The subsequent testimony attributed to his widow became central to the authorship controversy. The record distinguishes documented residence from later printing places and replaces an invalid portrait link; only a modern commemorative statue is known, not an authentic likeness.