in the decisive Laconian War by a coalition of other Greek city-states and Rome, and the resultant overthrow of its final king Nabis, in 192 BC. Sparta played no active part in the Achaean War in 146 BC when the Achaean League was defeated by the Roman general Lucius Mummius. Subsequently, Sparta became a free city under Roman rule, some of the institutions of Lycurgus were restored, and the city became a tourist attraction for the Roman elite who came to observe exotic Spartan customs. In 214 AD, Roman emperor Caracalla, in his preparation for his campaign against Parthia, recruited a 500-man Spartan cohort (lokhos). Herodian described this unit as a phalanx, implying it fought like the old Spartans as hoplites, or even as a Macedonian phalanx. Despite this, a gravestone of a fallen legionary named Marcus Aurelius Alexys shows him lightly armed, with a pilos-like cap and a wooden club. The unit was presumably discharged in 217 after Caracalla was assassinated. An exchange of letters in the deutero-canonical First Book of Maccabees expresses a Jewish claim to kinship with the Spartans: The letters are reproduced in a variant form by Josephus. Jewish historian Uriel Rappaport notes that the relationship between the Jews and the Spartans expressed in this correspondence has "intrigued many scholars, and various explanations have been suggested for the problems raised ... including the historicity of the Jewish leader and high priest Jonathan's letter to the Spartans, the authenticity of the letter of Arius to Onias, cited in Jonathan's letter, and the supposed 'brotherhood' of the Jews and the Spartans." Rappaport is clear that "the authenticity of [the reply] letter of Arius is based on even less firm foundations than the letter of Jonathan". Postclassical and modern Sparta In 396 AD, Sparta was sacked by Visigoths under Alaric I who sold inhabitants into slavery. According to Byzantine sources, some parts of the Laconian region remained pagan until well into the 10th century. The Tsakonian language still spoken in Tsakonia is the only surviving descendant of the ancient Doric language. In the Middle Ages, the political and cultural center of Laconia shifted to the nearby settlement of Mystras, and Sparta fell further in even local importance. Modern Sparta was re-founded in 1834, by a decree of King Otto of Greece. Structure of Classical Spartan society Constitution Sparta was an oligarchy. The state was ruled by two hereditary kings