THANKS DEREK FOR THE CONTRIBUTION
'The Epic of Gilgamesh', an ancient Mesopotamian poem, is the oldest surviving work of literature, written about 2000 BCE. The story is about King Gilgamesh of Uruk** who reigned around 2700 BCE and recounts his adventures in his search for immortality.
I don't know whether King Gilgamesh ever found immortality (I think it ended up in a jar beside Trump's bed), but it looks like he probably had some good nights out!
**in southern Iraq, next to the Euphrates River