Agares, (also Agarat, Agaros, or Agarus), is a 2nd demon of the Ars Goetia summoned by King Solomon and a Great Duke of Hell. He is the First Duke of the East who appears as a fair old man or handsome man riding a crocodile and carrying a hawk on his fist. He teaches languages, fetches back those who run away, and makes those who run stand still.
He overthrows supernatural and temporal dignities and can cause earthquakes. He was of the order of Virtues and oversees thirty-one to thirty-three legions. The Book of the Office of Spirits places him under Oriens and describes him as an old man riding a cockatrice, sans hawk.
The Grand Grimoire features him as a subordinate of Lucifuge Rofocale. Agares is reputed to have shut up in a brass vessel and cast into a deep lake or banished to the “lower Egypt" and also appears in the form of a Lord riding a crocodile and carrying a Peregrine falcon. He is said to make deserters return and can defeat enemies and finding pleasure in teaching immoral expressions
According to Thomas Rudd, Agares is opposed by the Shemhamphorasch angel Jelial. Sloane MS 3824 mentions Agares throughout in invocations to summon spirits that guard treasure, and in the "Experiment of Agares," meant to draw him into a crystal.
In demonological grimoires, such as the Pseudomonarchia Daemonum, the Lesser Key of Solomon, and the Dictionnaire Infernal, Agares is a duke "under the powers of the east," an "old man, riding upon a crocodile, and carrieng a hawke on his fist," who teaches languages, stops and retrieves runaway persons, causes earthquakes, and grants noble titles.The Lemegeton and the Pseudomonarchia Daemonum state that he commands 31 legions of demons, while the Livre des Esperitz (which describes him simply as an old man) gives him 36.
He might have taken his name after Greek figure of Argus.