Given its military pre-eminence, Sparta was recognized as the leading force of the unified Greek military during the Greco-Persian Wars, in rivalry with the rising naval power of Athens. Sparta was the principal enemy of Athens during the Peloponnesian War(between 431 and 404 BCE), from which it emerged victorious. The decisive Battle of Leuctra in 371 BCE ended the Spartan hegemony, although the city-state maintained its political independence until the Roman conquest of Greece in 146 BCE. After the division of the Roman Empire, Sparta underwent a long period of decline, especially in the Middle Ages, when many of its citizens moved to Mystras. Modern Sparta is the capital of the southern Greek region of Laconia and a center for processing citrus and olives.Sparta was unique in ancient Greece for its social system and constitution, which were supposedly introduced by the semi-mythical legislator Lycurgus. His laws configured the Spartan society to maximize military proficiency at all costs, focusing all social institutions on military training and physical development. The inhabitants of Sparta were stratified as Spartiates (citizens with full rights), mothakes (free non-Spartiate people descended from Spartans), perioikoi (free non-Spartiates), and helots (state-owned enslaved non-Spartan locals). Spartiate men (and some mothakes and perioikoi) underwent the rigorous agoge training regimen, and Spartan phalanx brigades were widely considered to be among the best in battle. Spartan women also enjoyed considerably more rights and equality with men than elsewhere in l antiquity.