5 ] Demonym Greek (Officially: Hellenic) Government Unitary parliamentary republic  -  President Karolos Papoulias  -  Prime Minister Antonis Samaras  -  Parliament Speaker Vangelis Meimarakis Legislature Parliament Independence from the Ottoman Empire    -  Declared 1 January 1822   -  Recognized 3 February 1830   -  Current Constitution 11 June 1975  Area  -  Total