In demonology, Vassago is a mighty Prince of Hell.
Vassago is a mighty Prince of Hell ruling over twenty-six legions of demons. He is said to be of the same nature as Agares and is sometimes called the Prince of Prophecy.
Vassago appears as an aged man riding a crocodile and carrying on his right wrist a Goshawk. His eyes are hollow and see into other dimensions, but he is blind in this dimension.
Vassago can be persuaded to tell the magician of events past and future, can discover hidden and lost things, and has a "good" nature.
The Third Spirit is a Mighty Prince, being of the same nature as Agares. He is called Vassago. This Spirit is of a Good Nature, and his office is to declare things Past and to Come, and to discover all things Hid or Lost. And he governeth 26 Legions of Spirits, and this is his Seal. Goetia - S. L. MacGregor Mathers (1904).
- Vassago plays a significant role in the novel The Day After Judgement by James Blish, where an ambiguous relationship to the majority of the Infernal forces is implied. A psychotic serial killer character takes on the name Vassago in the novel Hideaway by Dean Koontz.
- In Castlevania, Vassago appears in Lament of Innocence as a minor enemy. It resembles a floating, ghost-like creature armed with axes.
- A monster named Vassago appears in Tales of Destiny 2 as the second boss.
- In the novel Hideaway written by Dean Koontz, the primary antagonist who is a serial killer returned from Hell uses the name Vassago rather than his real name.
- In the Chaos Comics!, in old Lady Death Continuity (prior Avatar) the loyal steed of Lady Death in Hell, was a demonic unicorn called Vassago, used for the Diva of Death in her hellwars.
- In the fantasy-terror movie Hideaway (U.S.A., 1995, dir. Brett Leonard, starring Jeff Goldblum, Christine Lahti, Alice Silverstone, Alfred Molina),the villain, the pshico-possessed artist was called Vassago, for the demon that lived within him.