1) The Bible: There are several biblical references to Mesopotamia, which, over time, have aroused the interest of historians and archaeologists to unearth the long lost civilisation. The Old Testament notes down the location of Mesopotamia and refers to it as the kingdom between the rivers Euphrates and Tigris. It also speaks of a brick-built city named Shimar, which historians have inferred as Sumer.
2) Epic of Gilgamesh: The Epic of Gilgamesh is a rich source to learn about the religious life of the people of Mesopotamia. The epic states that the people of Mesopotamia were highly religious. All aspects of their lives, including life, death and love, were associated with one god or goddess. There is a reference to the goddess of creation Aruru and the god of heaven Anu.