(demon Amdusias from Collin de Plancy's Dictionnaire Infernal, 1863)

Amdusias (also spelled Amduscias and Amdukias) is one of the demons of hell described in the Goetia, one of the books of the manuscript grimoire known as the Lemegeton or Lesser Key of Solomon. He is mentioned by Johann Wierus in his Pseudomonarchia daemonum, and by Reginald Scot in The Discoverie of Witchcraft. The Goetia asserts about this demon:

"He is a Duke Great and Strong, appearing at first like a Unicorn, but at the request of the Exorcist he standeth before him in Human Shape, causing Trumpets, and all manner of Musical Instruments to be heard, but not soon or immediately. Also he can cause Trees to bend and incline according to the Exorcist's Will. He giveth Excellent Familiars. He governeth 29 Legions of Spirits."

In Collin de Plancy's illustration, shown above, Amdusias is crowned to show that he is a duke of hell. He has been given a horse's head to go with his single horn, because unicorns are usually represented in the shape of a horse. Two trumpets lie on the ground, and a third trumpet is slung over his shoulders.