This is what we found on Wikipedia regarding the Sparta:

Sparta was a prominent city-state in Laconia in ancient Greece. In antiquity, the state was known as Lacedaemon (Λακεδαίμων, Lakedaímōn), while "Sparta" referred to its capital, a group of villages in the valley of the Evrotas River in Laconia, in southeastern Peloponnese. Around 650 BC, it rose to become one of the major military powers in Greece, a status it retained until 371 BC.

Sparta was recognised 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 (431–404 BC), from which it emerged victorious after the Battle of Aegospotami. Thebes' victory over Sparta at the Battle of Leuctra in 371 BC ended Spartan hegemony and freed Messenia from Spartan rule; the loss of the slave labour this region provided sent the city into terminal decline as a military power, though it retained its independence until its forcible integration into the Achaean League in 192 BC. The city recovered some autonomy after the Roman conquest of Greece in 146 BC and became a tourist destination during the Roman era, restoring some measure of prosperity. However, Sparta was sacked in 396 AD by the Visigothic king Alaric, and underwent a long period of decline into the medieval period, when much of its population relocated to Mystras. Modern Sparta is a provincial town and the seat of the Laconia regional administration.

Sparta was unique in ancient Greece for its social system and constitution, which were supposedly introduced by the semi-mythical lawgiver Lycurgus. Spartan society was exceptionally militarised, focusing the entire attention of the Spartiate class on military training and physical development to the point of legally barring them from productive economic activity. The inhabitants of Sparta were rigidly stratified into Spartiates (citizens with full rights), mothakes and perioikoi (free non-citizens), and helots (state-owned enslaved non-Spartan locals), with helots making up the vast majority of the population; social mobility was nearly nonexistent. Spartiate men underwent the harsh agoge training regimen, and Spartan phalanx units were widely considered to be among the best in battle, though this was as much a matter of propaganda as battlefield prowess. Free Spartiate women enjoyed somewhat greater legal rights than elsewhere in classical antiquity, though helots suffered exceptionally harsh treatment at the hands of the Spartiates (particularly the Crypteia), causing repeated revolts. Sparta was a subject of fascination in its own day, as well as in later Western culture following the revival of classical learning. The admiration of Sparta is known as Laconophilia.