Wikipedia
Messenia (; Messinia, ) is a regional unit (perifereiaki enotita) in the southwestern part of the Peloponnese, one of 13 regions into which Greece has been divided by the Kallikratis plan, implemented 1 January 2011. Before 2011 Messenia was a nomos ( prefecture). The capital and the biggest city of Messenia in either case has been the city of Kalamata.
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. The population remained Greek although there was some immigration of Slavs, Albanians and Turks.
Messenia is a constituency in Peloponnese represented in the Hellenic Parliament. It elects five Members of Parliament (MPs) by the Reinforced proportional representation system of election. It comprises the Messenia Prefecture.
Its most high-profile MP is the former Prime Minister, Antonis Samaras of the New Democracy Party.