Demogorgon is a deity or demon associated with the underworld. Although often ascribed to Greek mythology, the name probably arises from an unknown copyist's misreading of a commentary by a fourth-century scholar, Lactantius Placidus. The concept itself can be traced back to the original misread term demiurge.

Genealogia deorum gentilium, known in English as On the Genealogy of the Gods of the Gentiles, is a mythography or encyclopedic compilation of the tangled family relationships of the classical pantheons of Ancient Greece and Rome, written in Latin prose from 1360 onwards by the Italian author and poet Giovanni Boccaccio.