Messenia or Messinia () was an ancient district of the southwestern Peloponnese, more or less overlapping the modern Messenia region of Greece. To the north it had a border with Elis along the Neda river. From there the border with Arcadia ran along the tops of Mount Elaeum and Mount Nomia and then through foothills of Taygetus. The eastern border with Laconia went along the Taygetus ridge up to the Koskaraka river, and then along that river to the sea, near the city of Abia.
Ancient Messenia descended continuously without change of name and with little change of territory to the modern Regional Unit of Greece of the same name.

History
Bronze age
The earliest inhabitants of Messenia were thought by the Greeks of the Classical period to have been 'Pelasgians', as in other regions of Greece. Supposedly, the Hellenic tribes had then arrived in Greece, and Messenia was settled by Aeolian Greeks. The Mycenaean city of Pylos has been identified with the modern site of Ano Englianos, in western Messenia. Excavations at Pylos and Nichoria have revealed for Messenia's late Bronze Age (14th century BC) a bureaucratic, agricultural kingdom ruled by the wanax at Pylos. The Messenians spoke Mycenaean Greek, and worshipped the Greek gods at local shrines like that at Sphagianes. During the legendary Dorian invasion of the Peloponnese during the Greek Dark ages, Messenia was supposedly invaded by Dorians under Cresphontes, arriving from Arcadia. They took as their capital Stenyclarus in the northern plain, and then extended, first their suzerainty, and then their rule over the whole district.

Archaic period
During the Archaic period the relative wealth of Messenia in fertile soil and favourable climate attracted the neighbouring Spartans. The first Messenian War broke out—as a result of the murder of the Spartan king Teleclus by the Messenians, it was claimed, which, in spite of the heroism of King Euphaes and his successor Aristodemus ended in the subjugation of Messenia by Sparta (ca. 720 BC). Two generations later the Messenians revolted and under the leadership of Aristomenes kept the Spartans at bay for some seventeen years (685 BC—668 BC). Descriptions of this revolt indicate that Messenia was allowed to retain a certain degree of autonomy after the first war, since they describe battles between organized armies on both sides. However, the stronghold of Ira (Eira) finally fell after a siege of eleven years. As the object of the Spartans was to increase the number of lots of land for their citizens, many of the conquered Messenians (those who did not manage to leave the area) were reduced to the condition of Helots. The Spartan poet Tyrtaeus describes how the Messenians endured the insolence of the masters:

Classical period
The Messenians revolted again in 464 BC, after a severe earthquake destroyed Sparta and caused great loss of life. The insurgents defended themselves for some years on the rock-citadel of Ithome, as they had done in the first Messenian War. The Spartans were unable to expel them from their stronghold on Mt. Ithome and so agreed to an Athenian mediated truce whereby the leading Messenians left the Peloponnese and were settled by the Athenians at Naupactus in the territory of Ozalian Locris.





