“Some think it [the universe] had no beginning and will have no end; while others have made bold to name its creator and describe its construction. The latter caused me the most astonishment, since they posited some god as the creator of the universe, but didn’t tell us further where he came from or where he stood when he fitted it all together. Yet it is impossible to conceive of time and place before the creation of the universe.”
- Lucian of Samosata in his dialogue ‘Icaromenippus’
I believe he also had a description of the beginning of the Universe that reads with similarity to recent theories on the Big Bang .... [unable to reference at the moment, though].