Sparta was a warrior society in ancient Greece that reached the height of its power after defeating rival city-state Athens in the Peloponnesian War (431-404 B.C.). Spartan culture was centered on loyalty to the state and military service. At age 7, Spartan boys entered a rigorous state-sponsored education, military training and socialization program. Known as the Agoge, the system emphasized duty, discipline and endurance. Although Spartan women were not active in the military, they were educated and enjoyed more status and freedom than other Greek women. Because Spartan men were professional soldiers, all manual labor was done by a slave class, the Helots. Despite their military prowess, the Spartans’ dominance was short-lived: In 371 B.C., they were defeated by Thebes at the Battle of Leuctra, and their empire went into a long period of decline.