Bio

Green Marvent was the founder and master of the Illuminated, a mysterious sect infiltrating Sigil’s factions in order to gain more influence. Evidently, he has been displaced by his lieutenant, Baltazo; Marvent’s ultimate fate has yet to be revealed.

SOURCE
Green Marvent is mentioned (but does not appear) in The Eternal Boundary, and is briefly described in “Recruiters” from Well of Worlds, as well as the Planescape Campaign Setting box set.