Eridu in Iraq is believed to be the oldest city known in the world. It had at least 4000 people living around a large temple dedicated to their patron God Enki (a.k.a. Ea).
Enki was the patron god of fresh water, salt water, crafts, creation, and the lord of semen who created the tigris and euphrates rivers by filling the beds with his own semen. He also was your prototypical daughter-fucking stud of a God. Pic related; here is more evidence all Gods are manifestations of a single leecherous bloke with oily hair.
He also created humans from clay to serve the Gods, except a rival god decided he had enough bodies servicing him, and tried to kill the new humans with a great flood. Enki told the humans to build a ship in a dream, possibly to protect his plans for a new harem.