Eliezer ben Isaac ha-Gadol was a German rabbi of the eleventh century. He was a pupil of his cousin R. Simon ha-Gadol of Mainz and of R. Gershom Me'or ha-Golah. David Conforte, relying on the statement in the tosefta to Shab. 54b, says that Eliezer ha-Gadol was the teacher of Rashi; but Rashi himself, in citing Eliezer, does not say so. In Rashi's quotation he is sometimes called Eliezer ha-Gadol and sometimes Eliezer Gaon, which induced Azulai to consider them as two separate persons.
According to a provenance of a sacred tradition—sometimes presumed to describe the transmission of early medieval Kabbalah from Babylon to Western Europe—with the provenance itself attributed to Eleazar of Worms (13th century), this ‘Eliezer the Great’ or Eliezer Ben Isaac ha-Gadol, of the early 11th century generation of Ashkenazi Hasidim, was an ancestral member of this lineage of teachers ,and a member of the Kalonymids: the Ba’al Shems or Masters of the Name in medieval Germany.
This article incorporates text from a publication now in the public domain: Richard Gottheil and M. Seligsohn (1901–1906). "Eliezer ben Isaac ha-Gadol". In Singer, Isidore; et al. (eds.). The Jewish Encyclopedia. New York: Funk & Wagnalls. Its bibliography: