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This article is about the philosopher. There was also a Greek mythological Leucippus (mythology). A genus of hummingbirds also is named Leucippus.

Leucippus or Leukippos (Greek: Λεύκιππος, first half of 5th century BC) 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^[1].

Contents 1 Overview 2 Quotes 3 Footnotes 4 Sources 5 External links

There are no existing writings which we can attribute to Leucippus, since his writings seem to have been folded into the work of his famous student Democritus (q.v. for more on atomism). In fact, it is virtually impossible to identify any views about which Democritus and Leucippus disagreed.

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 x. 7. However Aristotle and Theophrastus explicitly credit Leucippus with the invention of Atomism.

The most famous among Leucippus' lost works were titled Megas Diakosmos (The Great Order of the Universe or The great world-system^[2]) and Peri Nou (On mind).

A single fragment of Leucippus survives^[3]:

Nothing happens at random (maten), but everything from reason (ek logou) and by necessity.

– Leucippus, Diels-Kranz 67 B1

1. ^ The Cambridge Companion to Early Greek Philosophy, pg. xxiii. Note that Democritus was a resident of Abdera. Some said Leucippus was from Elea, for his philosophy is associated with the Eleatic philosophers.
2. ^ Ibid., pg. xxiii.
3. ^ Diels/Kranz, Die Fragmente der Vorsokratiker [I]

A.A. Long (ed.), The Cambridge Companion to Early Greek Philosophy (pgs. xxiii, 185)

Diels-Kranz, Die Fragmente der Vorsokratiker [I] 67A

Laertius Diogenes, Diogenes Lartius: Lives of Eminent Philosophers, IX.30-33

• Stanford Encyclopedia of Philosophy entry

Pre-Socratic philosophers

Milesian School: Thales • Anaximander • Anaximenes of Miletus Pythagoreans: Pythagoras • Philolaus • Alcmaeon • Archytas • Timaeus Ephesian School: Heraclitus — Eleatic School: Xenophanes • Parmenides • Zeno of Elea • Melissus of Samos Pluralist School: Anaxagoras • Empedocles — Atomist School: Leucippus • Democritus Sophism: Protagoras • Gorgias • Prodicus • Hippias Diogenes of Apollonia • Pherecydes