Lucretius

Roman Poet and Philosopher.

Titus Lucretius Carus (ca. 99 BC – ca. 55 BC) was a Roman poet and philosopher. His only known work is the epic philosophical poem De rerum natura about the beliefs of Epicureanism, and which is translated into English as On the Nature of Things or "On the Nature of the Universe".

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Source:

1.) "Most histories of atheism choose the Greek and Roman philosophers Epicurus, Democritus, and Lucretius as the first atheist writers. While these writers certainly changed the idea of God, they didn't entirely deny that gods could exist." Ancient Atheists, BBC.co.uk.