The Gorgons were three in number, the daughters of Phorcys ancd Ceto, were hideous beyond belief and were:

Stheno and Euryale who were immortal, and Medusa, who was mortal. Horrible even in hell, to see them was to be turned to stone. Their dwelling-place was on the farthest shore of Ocean, and their neighbours, the Hesperides, were the daughters of the night.

The Graiae, the grey-haird women, protected the Gorgons, whom they equalled in ugliness. Like their unattractive sisters, they were also three in number, and were:

Pephredo, Enyo and Deino. Born grey, they possessed only one eye and one tooth between them, which they constantly passed to one another. The sun or the moon never reached their home, the boundary of the Gorgonian plain at the uttermost end of Libya.

Some of the giants were said to be half human monsters with serpents for feet, spawned from the blood of the wounds of Uranus during the Titan rebellion. Other giants had a more "natural" birth. The giants were:

Antaeus, son of Poseidon, and a champion wrestler, built a house out of the skulls of his victims. The secret of his power was that each time he was thrown to the ground he arose stronger and more powerful than before, the contact with his mother earth being the source of his strength. He finally met his match when the hreo, Heracles, realising his secret, lifted Antaeus high in to the air and crushed him to death.

Tityus, an enormous giant who covered nine acres as he lay on the ground, attempted to violate Leto, and for this he was slain by the arrows of her children, Apollo and Artemis, and then hurled by Zeus into Tartarus, where his huge, outstretched bulk occupied so vast a space. Tityus was further punished by having two vultures constantly tearing at his liver - regarded by the Greeks as the seat of the passions - which was perpetually renewed as soon as it was devoured.

Scylla and Charybdis were two monstrous female creatures inhabiting the two dangerous cliffs on either side of what is now the straits of Messina, near Sicily. Scylla had six long necks each with a terrifying head, which she stretched out to threaten passing ships. Charybdis, on the opposite rock, was said to draw in and gorge forth the dark water, creating a continuous whirlpool that was even more dangerous to the sailors than the hideous Scylla. These straits were passed by the argonauts and later by Odysseus. Scylla, it was said, had once been a beautiful maiden, beloved of Glaucus, a sea god. Rejected by Scylla, Glaucus appealed to Circe, the enchantress, for a love potion, bit Circe herself fell in love with Glaucus and, to do away with Scylla, prepared a poison for her. Circe poured the poison into the waters where Scylla bathed and at once was transformed into a hideous creature. Charybdis was once a woman who stole the oxen of Heracles and was turned into a whirlpool by Zeus.

The Cyclops were monsters with one single wheel sized eye in the middle of their forehead, and were made up of the following beings:

The Hecatoncheires were monsters that had fifty heads and one hundred hands, and were made up from the following beings: