Bigby is a powerful wizard from Oerth, a former apprentice of Mordenkainen and still his most reliable ally. He is a pale, gaunt, hooded man.1
Somehow, Bigby has become famous enough in Sigil that the locals built a statue in his honor.2 There was also once a school there called Bigby's College of Academic Arts, but it was seized by the Fated for tax evasion and turned into the Hall of Records.3
Bigby was once imprisoned and impersonated by the greater Yugoloth Zender.4
Sources:
1. Mona, Erik, and Gary Holian. "Wheels within Wheels: Greyhawk's
Circle of Eight." Living Greyhawk Journal #0. Available online: [3]
2. In the Cage: A Guide to Sigil, page 39: "Three streets beyond the enormous statue of some prime named Bigby,
just a short walk from the Armory, the Golden+Bariaur serves a
clientele from the Upper Planes, from Arborea to Mount Celestia."
3. The Factol's Manifesto, page 62: "Foreclosed upon for a debt exactly one week late in payment, Bigby's College of Academic Arts was converted into the Hall of Records, a campus of six buildings, many centuries ago."
4. City of Greyhawk boxed set, Adventure Card #13
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