The demon Häagenti 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-eighth Spirit is Haagenti. He is a President, appearing in the Form of a Mighty Bull with Gryphon's Wings. This is at first, but after, at the Command of the Exorcist he putteth on Human Shape. His Office is to make Men wise, and to instruct them in divers things; also to Transmute all Metals into Gold; and to change Wine into Water, and Water into Wine. He governeth 33 Legions of Spirits, and his Seal is this, etc.