370 BC

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Events

By place

Greece

* Cleomenes II succeeds his brother Agesipolis II as Agiad king of Sparta.
* The Spartans under King Agesilaus II invade Arcadia. After appealing in vain to the Athenians for help, Arcadia turns to the Thebans. Epaminondas of Thebes arrives with an army, finds the Spartan have retired and follows them.
* With the support of Thebes, the Arcadian capital city of Megalopolis is completed and a democratic system is set up with an Assembly of Ten Thousand and a Council of fifty.
* The tyrant of Thessaly, Jason of Pherae, dies, after making Thessaly a powerful force in Greek politics.

By topic

Art

* The sculptor Praxiteles begins his active career in Athens (approximate date).

Mathematics

* Eudoxus of Cnidus develops the method of exhaustion for mathematically determining the area under a curve.

Births

* Marcus Valerius Corvus, Roman hero
* Theophrastus, Greek philosopher, a native of Eressos in Lesbos, the successor of Aristotle in the Peripatetic school (d. c. 285 BC)

Deaths

* Agesipolis II, Agiad king of Sparta
* Democritus of Abdera, Greek philosopher (approximate date) (b. c. 460 BC)
* Hippocrates of Cos, Greek physician (b. c. 460 BC)
* Jason of Pherae, tyrant of Thessaly