The Titans are...The twelve giant offspring of GAIA and URANUS. They come in brother-sister pairs: CRONUS and RHEA, OCEANUS and TETHYS, HYPERION and THEA, IAPETUS and THEMIS, CRIUS and MNEMOSYNE, and COEUS and PHOEBE. (The six sisters are also called the TITANIDES, by the way.)They were so big and painful in labour that poor GAIA couldn't bear to bear any more. So she got CRONUS to help with some radical birth control and newly neutered URANUS was overthrown.After the deed was done, CRONUS and RHEA ruled over the Gods and the world entered a Golden Age of peace and prosperity. Of course this didn't last as the Gods warred against them and a disgruntled ZEUS banished them all to Tartarus Prison.