368 BC

By place

Greece

• While the previous year's intervention by the Macedonians in Thessaly is successful, after the Macedonian troops withdraw, Alexander of Pherae treats his subjects as cruelly as before. So the Thessalians seek Thebes' support. Pelopidas is sent to their assistance, but is treacherously seized and imprisoned.
• In response, Epaminondas is reinstated in command of Theban troops and leads the Theban army into Thessaly, where he outmanoeuvres the Thessalians and secures the release of Pelopidas without a fight.
• At the instigation of Alexander's brother-in-law, Ptolemy of Aloros, Alexander II of Macedon is assassinated during a festival. Although Alexander's brother, Perdiccas III becomes the next king, he is under age, and Ptolemy is appointed regent.

  China

• Zhou Xian Wang becomes King of the Zhou Dynasty of China.

  By topic

Philosophy

• Plato's Republic is completed. It lays down the rules for an ideal, righteous society and suggests that kings ought to be philosophers.