マンティネイアの戦い
However, the predominance of Thebes was short-lived, as the states that it protected refused to subject themselves permanently to its control. Thebes renewed rivalry with Athens, who had joined with them in 395 BC in fear of Sparta, but since 387 BC had endeavoured to maintain the balance of power against its ally, prevented the formation of a Theban empire. With the death of Epaminondas at the Battle of Mantinea (362 BC), the city sank again to the position of a secondary power.