The ancient city-state known for its military prowess and the formation of the Spartan army is Sparta. Located in the Peloponnese region of Greece, Sparta was renowned for its rigorous and austere military training. Spartan society was structured around creating elite warriors, known as Spartiates, who underwent intense physical training from a young age through the agoge system. Their disciplined approach to warfare ensured that they excelled in battles, especially during the Persian Wars and the Peloponnesian War. The legacy of Spartan military culture has had a lasting impact on military thought and training throughout history.