Ahriman
Tyrant
Almost every single civ started on a river, maybe even every single one. It was even more important for civs in eras with less advanced technology. Like people said, the Tigris, Euphrates, Nile, Ganges and Yellow (forgot the other Chinese river) rivers are famous for being the beginnings of civilization.
Add Indus to that list, and Mekong to some extent.
And then later, Rhine, Danube, Volga, Niger, Mississippi.