Vepar (Demon)

The demon Vepar appears in the grimoires Book of Incantations, The Discoverie of Witchcraft, The Book of the Office of Spirits, Pseudomonarchia Daemonum, and The Lesser Key of Solomon

From The Lesser Key of Solomon, Crowley/Mathers edition:

Vepar

The Forty-second Spirit is Vepar, or Vephar. He is a Duke Great and Strong, and appeareth like a Mermaid. His office is to govern the Waters, and to guide Ships laden with Arms, Armour, and Ammunition, etc., thereon. And at the request of the Exorcist he can cause the seas to be right stormy and to appear full of ships. Also he maketh men to die in Three Days by Putrefying Wounds or Sores, and causing Worms to breed in them. He governeth 29 Legions of Spirits, and his Seal is this, etc.

Timeline of related events

1600

1700

1800

1810

In this decade: Book of Incantations written (lists this demon)