The cthonic offspring of Uranus and Gaia: The giants going by the name of Hecatonchires (from Hecaton - a hundred and chires - arms ) - Latin name
Centimani. Ancient half-man half-serpent monstrosities the ancient greeks payed homage to more than worshipped, as the rulers of the earth at the times before man. The Titans were the third set of children Gaia and Uranus produced, and Cyclopes were the second.
Their father, disgusted with their horrific multitude of arms and heads, threw them in the depths of the abyssal Tartarus. Gaia asked the Titans to go and help her three outcast children but only Cronus agreed to help. Cronus hid behind the bed of Uranus and Gaia, and as they were starting to get to work, he attacked and castrated his father (!), throwing his dismembered member (oh oh, pleonasm!) in the sea. From there, Aphrodite was born. But that dirty Cronus - now ruler- then threw the Hecatochires back into Tartarus, until much later Zeus (having killed his own father, Cronus) rescued them to fight against the rest of the Titans. After that whole messy deal that was the Titanswar, sorta resolved, the Hecatonchires were then made the ever-watchful guardians for Tartarus. Also considered sea-deities. Here's a funny account:
http://www.godchecker.com/pantheon/greek-mythology.php?deity=HECATONCHIRES
A third generation greek black metal band seriously need to start making a concept album about all this.