Which or these best describes Lucretius?

Lucretius was a Roman poet and philosopher known for his epic poem "De Rerum Natura" (On the Nature of Things), which presented the teachings of Epicureanism. He explored themes such as the nature of the universe, the atomic theory of matter, and the pursuit of a tranquil life through the avoidance of desires and fears. His work had a significant influence on later philosophers and thinkers.