Phenex
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In demonology, Phenex is a Great Marquis of Hell and has twenty legions of demons under his command. He teaches all wonderful sciences, is an excellent poet, and is very obedient to the conjuror. Phenex hopes to return to Heaven after 1,200 years, but he is deceived in this hope.
He is depicted as a phoenix, which sings sweet notes with the voice of a child, but the conjurer must warn his companions (for he has not to be alone) not to hear them and ask him to put in human shape, what he does after a while.
The etymology of his name is obviously the name of the mythical phoenix.
Other spellings: Pheynix, Phoenix, Phoeniex.
See also The Lesser Key of Solomon, Ars Goetia.