Stolas

Stolas, also known as Stolos, is a Great Prince of Hell. He is seen as a fallen angel and commands 26 legions of demons. He is depicted as either being a crowned owl with long legs, a raven, or a man.

Overview
He teaches astronomy, history, and the knowledge of poisonous plants, herbs and precious stones.

Stolas in Christian and Occult Demonologies
Throughout history multiple formalized classifications of demons have been proposed. None of them however are considered canon by modern mainstream Christian denominations. Instead, lists of formalized demonologies tend to remain popular in occult traditions.

Stolas in the Pseudomonarchia Daemonum
The Pseudomonarchia daemonum, or False Monarchy of Demons, by the Dutch occultist Johann Weyer, was published as an appendix to his book titled De praestigiis daemonum, or On the Tricks of Demons, in 1577. The description of Stolas from the Pseudomonarchia daemonum is as follows:


 * "Stolas is a great prince, appearing in the forme of a nightraven, before the exorcist, he taketh the image and shape of a man, and teacheth astronomie, absolutelie understanding the vertues of herbes and pretious stones; there are under him twentie six legions." 

Stolas in the Lemegeton Clavicula Salomonis (Ars Goetia)
The Lemegeton Clavicula Salomonis or Lesser Key of Solomon is an anonymously written book of demonology that is believed to have been complied sometime during the 17th century CE. The work is divided into five books, the first of which, known as the Ars Goetia, lists seventy-two demons. The Ars Goetia is heavily based off of Johann Weyer's Pseudomonarchia daemonum. The Ars Goetia's passage on Stolas is as follows:


 * "The Thirty-sixth Spirit is Stolas, or Stolos. He is a Great and Powerful Prince, appearing in the Shape of a Mighty Raven at first before the Exorcist; but after he taketh the image of a Man. He teacheth the Art of Astronomy, and the Virtues of Herbs and Precious Stones. He governeth 26 Legions of Spirits; and his Seal is this, which is, etc."