Hecate, in the Greek mythology a mysterious divinity of the Titan brood and held in honour by all the gods, identified with Phoebe in heaven, Artemis on earth, and Persephone in Hades, as being invested with authority in all three regions; came to be regarded exclusively as an infernal deity, having under her command and at her beck all manner of demons and phantom spirits.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Hecatæus of Miletus * Hecker, Friedrich Karl Franz