In Greek mythology, the Graeae were three daughters of Phorcys and Ceto: Deino, Pephredo, and Enyo; their names meaning respectively 'alarm', 'dread', and 'horror'. They were sisters and at the same time guardians of the Gorgons, they were conceived as misshapen hideous creatures, hoary and withered from their birth, with only one eye and one tooth for the common use of the three, and were supposed to inhabit a dark cavern near the entrance to Tartarus. The belief in their existence seems to have been originally suggested by the grey fog or mist which lies upon the sea and is a frequent source of danger to the mariner. It is said that Perseus obtained from them the necessary information as to the dwelling of the Gorgons by seizing; their solitary eye and tooth, and refusing to return them until they showed him the way. Research Graeae
In Greek mythology, the Hekatoncheires were three giants, each with a hundred hands and fifty heads. They were children of Gaea and Uranus. When they were born, Uranus pushed them back into Gaea's womb. In her resulting pain Gaea persuaded Cronos to castrate his father and overthrow him. When Cronos became supreme he was scared of the power of the Hekatoncheires and he too imprisoned them, locking them in Tartarus with their brothers the Cyclops. Research Hekatoncheires
Hemera was the Greek goddess of day. She was born from Erebus and Nyx. She emerged from Tartarus as Nyx left it and returned to it as she was emerging from it. Research Hemera
In Greek mythology, Hynos or Somnus, was a son of Night, and the twin brother of Thanatos (death), with whom he lived in deep subterranean darkness at the entrance to Tartarus. His influence extended to gods as well as men, and by the latter he was viewed as a special benefactor, giving the weary refreshing rest, and sufferers alleviation of their pain. He was represented in different forms and attitudes, with different attributes - now nude, or lightly or heavily clad, now standing, or striding hastily, or reposing heavily; or as a powerful youth holding a poppy or a horn, from which sleep trickled down on those reposing; or as a child, and sometimes as a bearded, aged man. On his head were the wings of a hawk or a night bird, and beside him frequently a lizard. He was looked on as a favourite of the Muses, apparently because of the dreams he was supposed to communicate to men. Research Hypnos
In Greek mythology, Tartarus was the part of Hades where the wicked were punished. It was surrounded by a brazen wall and veiled in perpetual and impenetrable darkness. Research Tartarus
In Greek mythology, Tityos was a son of Gaea and one of the giants. He offered violence to Leto and was killed by Zeus or Apollo. By way of punishment in Tartarus he was stretched on the ground, while two vultures perpetually devoured his liver. Research Tityos
 
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