The demon Ose appears in the grimoires Book of Incantations, The Discoverie of Witchcraft, The Book of Spirits, The Book of the Office of Spirits, Pseudomonarchia Daemonum, and The Lesser Key of Solomon
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Fifty-seventh Spirit is Oso, Ose, or Voso. He is a Great President, and appeareth like a Leopard at the first, but after a little time he putteth on the Shape of a Man. His Office is to make one cunning in the Liberal Sciences, and to give True Answers of Divine and Secret things; also to change a Man into any Shape that the Exorcist pleaseth, so that he is so changed will not think any other thing than that he is in verity that Creature or Thing he is changed into. He governeth 3 1 Legions of Spirits, and this is his Seal, etc.
Timeline of related events
1536Publication of De praestigiis daemonum (lists this demon)
1563First known appearance of The Book of the Office of Spirits (lists this demon)
1584Publication of The Discoverie of Witchcraft (lists this demon)
1641Publication of the Lesser Key of Solomon (lists this demon)