Lucretius (97?–55? B.C.),a Roman poet and philosopher. His full name was Titus Lucretius Carus. His principal work is De Rerum Natura (On the Nature of Things), in six books of hexameter verse. This expounds the scientific and philosophical ideas of Epicurus, a Greek philosopher who believed that pleasure is the chief good. Lucretius also stated Epicurus' belief—which Epicurus had borrowed from Democritus, another Greek philosopher—that all matter consists of atoms. Although the quality of Lucretius' writing is uneven, in places he reaches great poetic heights in imagery and language.

Almost nothing is known of Lucretius' life. A traditional story is that he committed suicide when a love potion his wife gave him caused him to become insane.