The eldest Gods are the nature phenomena and the elements.
In the beginning there was Chaos. It is difficult to explain how everything was around that time, since everything was a little bit confusing. From Chaos emerged Erebus and Night, whose children were Day and Aether, a thin and shinning air layer half mortal and half divine. From Night emerged also Death, Sleep, Dreams, Moirae, Hespriden and Eris.
From the Earth, Gaia, raised up the Sky, Uranus. At the same time were created Eros, the spirit of love, and the soft and gender hills of mother Earth. From these hills were born the Titans.