The philosophical poem On the Nature of Things was written by the Roman Lucretius (c.99 BC – 55 BC). It basically defends Epicurean natural philosophy that intends to dispel the fear of death by, among other issues, referring to atomism or atoms and the void.
Because the philosophical poem contains many information regarding nature and the universe, it is considered to be an important work in the history of science. However some articles doubt this reputation. Here is a link to one of these texts.