387 BCE

Plato founds the Platonic Academy in Athens, where he teaches Aristotle until 347 BC. With the aid of the Lucanians, Dionysius I of Syracuse devastates the territories of Thurii, Crotone, and Locri in mainland Italy. When Rhegium falls, Dionysius becomes the chief power in Greek Southern Italy. He then turns his attention to the Adriatic and founds the colonies of Ancona (Ankon) and Adria (Adrìa). Rome begins to rebuild after being invaded by the Gauls under Brennus.

Geopolitics & Diplomacy

Plato is forced by Dionysius to leave Syracuse after having exercised the right of free speech too broadly. Plato returns to Athens, outside which he founds a school.source
With the aid of the Lucanians, Dionysius I of Syracuse devastates the territories of Thurii, Crotone, and Locri in mainland Italy. When Rhegium falls, Dionysius becomes the chief power in Greek Southern Italy. He then turns his attention to the Adriatic and founds the colonies of Ancona (Ankon) and Adria (Adrìa).source

Conflict & Security

Rome begins to rebuild after being invaded by the Gauls under Brennus.source

Culture & Society

Plato founds the Platonic Academy in Athens, where he teaches Aristotle until 347 BC.source
Marcus Furius Camillus introduces the Capitoline Games (Ludi Capitolini) in honour of Jupiter Capitolinus, and in commemoration of Rome's Capitol not being captured by the Gauls.source

Deaths

Rhydondis, Greek mercenary (b. c. 386 BC)source
Wen, marquis of the State of Wei, Chinasource