Battle of Mantinea (362 BC)
The (second) Battle of Mantinea or Mantineia was fought on 4 July 362 B.C. between the Thebans, led by Epaminondas and supported by the Arcadians and the Boeotian league against the Spartans, led by King Agesilaus II and supported by the Eleans, Athenians, and Mantineans. The battle was to determine which of the two alliances would dominate Greece. However, the death of Epaminondas and his intended successors would cost Thebes the military leadership and initiative to maintain Theban supremacy in the region. Similarly, the Spartans were weakened by yet another defeat and loss of troops.