Both world temperatures and precipitation were higher than normal.
Jason of Pherae becomes tyrant of Thessaly.
Dionysius I of Syracuse attempts to restore Alcetas I of Epirus to the throne.
Plato forms his Academy, teaching mathematics, astronomy and other sciences as well as philosophy. It is dedicated to the god Academus. Philanthropists bear all costs; students pay no fees.
Plato's Symposium is published in which it is argued that love between males is the highest form and that sex with women is lustful and only for means of reproduction. Only with men can the Greek male reach his full intellectual potential.
Democritus announces that the Milky Way is composed of many stars