Eleazar ben Judah takes part in a…

Eleazar ben Judah takes part in a synod at Mainz in 1223, which considers such questions as business relations with Christians and the inequitable exemptions of particularly favored Jews from the tax imposed by the government.

His greatest work is his ethical code Rokeach (Book of the Perfumer), for which he is sometimes known as Eleazar Rokeach.

The work is prefaced with a number of chapters dealing with the essential principles of Judaism, in which Eleazar attempts to explain mystical concepts, including the unity of God, in terms of Halakha (law).

Eleazar is an angelologist, not only in his mystic theories of theurgy (the art of persuading or compelling supernatural beings to one's bidding, but also in his writings on the kavod (”divine glory”), a concept also shared by his master, Judah ben Samuel the Hasid, who wrote a mystical work, existing only in citations, on the subject.

Eleazar believes that the kavod, a ruling angel, is an emanation from God and the knowable aspect of him, while God himself is infinitely transcendent and unknowable.