The demon Orias appears in the grimoires Book of Incantations, Hygromanteia, Testament of Solomon, The Discoverie of Witchcraft, Pseudomonarchia Daemonum, and The Lesser Key of Solomon
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Fifty-ninth Spirit is Oriax, or Orias. He is a Great Marquis, and appeareth in the form of a Lion, riding upon a Horse Mighty and Strong, with a Serpent's Tail; and he holdeth in his Right Hand two Great Serpents hissing. His Office is to teach the Virtues of the Stars, and to know the Mansions of the Planets, and how to understand their Virtues. He also transformeth Men, and he giveth Dignities, Prelacies, and Confirmation thereof; also Favour with Friends and with Foes. He doth govern 30 Legions of Spirits; and his Seal is this, etc.
Timeline of related events
1536Publication of De praestigiis daemonum (lists this demon)
1584Publication of The Discoverie of Witchcraft (lists this demon)
1641Publication of the Lesser Key of Solomon (lists this demon)