Leucippus born on the 5th century BC and was among the earliest philosophers of atomism, the idea that everything is composed entirely of various imperishable, indivisible elements called atoms. He was born at Miletus or Abdera
He was a contemporary of Zeno, Empedocles and Anaxagoras of the Ionian school of philosophy. His fame was so completely overshadowed by that of Democritus, who systematized his views on atoms, that Epicurus doubted his very existence, according to Diogenes Laertius.
The most famous among Leucippus’ lost works were titled Megas Diakosmos (The Great Order of the Universe or The great world-system) and Peri Nou (On mind).