The demon Sabnock appears in the grimoires Book of Incantations, The Discoverie of Witchcraft, Pseudomonarchia Daemonum, and The Lesser Key of Solomon
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Forty-third Spirit,as King Solomon commanded them into the Vessel of Brass, is called Sabnock, or Savnok. He is a Marquis, Mighty, Great and Strong, appearing in the Form of an Armed Soldier with a Lion's Head, riding on a pale-coloured horse. His office is to build high Towers, Castles and Cities, and to furnish them with Armour, etc. Also he can afflict Men for many days with Wounds and with Sores rotten and full of Worms. He giveth Good Familiars at the request of the Exorcist. He commandeth 50 Legions of Spirits; and his Seal is this, etc.