The lammasu and the greater lammasu appeared in second edition in the Monstrous Compendium Volume Two (1989), and reprinted in the Monstrous Manual (1993). The celestial lammasu appeared in the Monstrous Compendium Outer Planes Appendix (1991). The lammasu was further developed in Dragon #224 (December 1995).
The lammasu appeared in the third edition Monster Manual (2000), and in the 3.5 revised Monster Manual (2003).
They are also lawful, although they have little interest in the conflict between law and chaos. Their innate magical powers let them cast spells as a 7th-level cleric.
A type of celestial, half-dragon lammasu known as a golden protector is also described in the Monster Manual. They are the offspring of a celestiallammasu and a gold dragon and live in the material plane where they combat evil. Their draconic heritage lets them breathe fire.