In the Arbatel de magia veterum, Bethor is the Olympic spirit given governance over the sphere of Jupiter, and the text presents him as quick to answer when called. He is credited with raising those who bear his character to high dignity and office, opening hidden treasures, reconciling the spirits of the air so that they give true answers, and moving precious stones from one place to another. The Arbatel also attributes to him medicines that work with unusual speed, familiar spirits drawn from the airy realm, and a notably long lifespan granted to those he favors, extending it well beyond the ordinary span the text allows most people.
Like Aratron, Bethor commands a nested court of subordinate kings, princes, dukes, counsellors and ministers, and his reign is counted among the seven successive 490 year ages the Arbatel assigns to the Olympic spirits as a group. The text frames Jupiter's associations, dignity, wealth, favor and long life, consistently with the planet's wider role across astrological tradition, rather than inventing them freshly for this one grimoire. This entry describes what the Arbatel claims for Bethor rather than treating any of it as verified or as instruction to be carried out.