Why Travel and Exposure Shaped Plato’s Philosophical Views

Travel shaped some parts of Plato’s philosophy, but not in the general way often claimed. There is good reason to link his travels to his politics, because of his repeated visits to Syracuse, and to his mathematics, because of his contact with the Pythagoreans in Italy. There is no sound evidence that exposure to foreign cultures produced his Theory of Forms or his ethics. Those grew out of Socrates, out of the problem of knowledge, and out of Athenian experience. The itinerary itself rests on the Seventh Letter (authenticity disputed) and on Diogenes Laertius, who wrote more than five centuries later, and part of it is tradition (Cyrene, Egypt) rather than fact.

Did travel shape the Theory of Forms?

Not in any way the evidence can show. Aristotle, who spent about twenty years in Plato’s Academy, traces the origin of the Forms to two sources (Metaphysics I.6, 987a29–b14): the influence of Heraclitus, through Cratylus, who led Plato to think that nothing perceptible can be an object of knowledge, and the search of Socrates for universal definitions in ethics (see also XIII.4, 1078b9–32). Aristotle adds that Plato combined these with Pythagorean ideas of number. None of this involves exotic cultures. The Pythagorean part may have been strengthened by the contact with Archytas in Italy (Seventh Letter 338c–d), but Aristotle’s account does not suggest the central idea came from abroad.

The claim that travel “showed Plato how people perceive the world differently, leading to the Forms” does not appear in any ancient source. It is a plausible-sounding modern invention, and the arguments Plato actually gives for the Forms, such as recollection, the opposition of perception and knowledge, and the nature of mathematical truth, are philosophical arguments rather than reports of cultural comparison.

Did travel shape his ethics?

Mostly no. Plato’s ethical questions begin with Socrates: what is courage, what is justice, can virtue be taught. They were already formed when he was a young man in Athens. What the dialogues do show is that Plato was aware of other customs and willing to use them as examples. In the Republic (435e–436a) he describes the Thracians and Scythians as spirited, the Phoenicians and Egyptians as lovers of money, and the Greeks as lovers of knowledge. That is a generalisation, of the kind Greeks of his period made about foreign peoples, and not the result of fieldwork. In the Laws (637d–e) he refers to the drinking customs of the Scythians, Thracians, Persians and others as contrasts with those of Sparta and Crete. These show knowledge of foreign practice, mostly gathered from Greek authors and travellers’ reports, and they do not show that travel changed his views of virtue.

Did travel shape his political philosophy?

This is where the connection is strongest, with a qualification. According to the Seventh Letter (324a–326d), the experience of the Thirty Tyrants and the trial of Socrates led Plato to conclude, before he left Athens, that cities would never be well governed unless philosophers ruled or rulers became philosophers. His journeys to Sicily did not create the idea but gave him a chance to test it. Under Dionysius I and later Dionysius II he met the reality of tyranny, formed his bond with Dion, and learned how hard it is to educate a ruler (Seventh Letter; Diogenes Laertius III.18–23). It is reasonable to think that this experience stands behind his portrait of the tyrannical man in the Republic and his later caution in the Laws, though Plato never says so and the connection is an interpretation. Tradition also says that Dionysius I had him sold as a slave on Aegina, a late anecdote discussed in why Plato was enslaved.

It would be wrong to say he surveyed “governance systems” in Egypt or Cyrene. Nothing suggests he studied the constitutions of those places, and Egypt is only a reported visit.

So what role did travel really play?

• Strongly supported: contact with the Pythagoreans in southern Italy, and the Syracuse episodes, which shaped his political outlook and his later letters.
• Reported but uncertain: Megara and Cyrene (Diogenes Laertius III.6), and Egypt.
• Not supported: study in Persia, India or Asia Minor. Diogenes (III.7) says Plato intended to visit the Magi but was prevented by war.

For the full itinerary, see how Plato’s travels influenced his philosophy and for the long-running idea of Eastern influence, see Plato’s travel and exposure to different philosophies. For the influences that did most to shape him, see how Socrates influenced Plato’s philosophy and what inspired Plato.