Realm · approximate borders · 1945–1952

Polish People's Republic

Post-war Poland within the borders set at Yalta and Potsdam: the Oder–Neisse line in the west, the Curzon line (roughly) in the east, and the southern half of East Prussia. Formally the Republic of Poland until the 1952 constitution renamed it the Polish People's Republic; a Soviet satellite from the communist takeover of 1947.

A small border exchange with the Soviet Union followed in 1951 (Ustrzyki Dolne for the Sokal area). Sources: Wikipedia 'Polish People's Republic', 'Oder–Neisse line', 'Curzon Line'.

See Polish People's Republic on the map in 1945

On the map: 1945–1952
Capital: Warsaw

Rulers named in the sources

Bolesław Bierut (president, then party leader) 1945–1956
Edward Osóbka-Morawski (prime minister) 1945–1947
Józef Cyrankiewicz (prime minister) 1947–1952

Eastern European states, 82 BC – 1952

States of central-eastern and south-eastern Europe, the Baltic and the north-western Caucasus: Burebista's and Decebalus' Dacia, the principality of Abasgia, Rus' Tmutarakan, Circassia until the Russian conquest of 1864, the Emirate of Bari, the Albanian principalities of Arbanon and the Thopia and Skanderbeg's League of Lezhë, Zeta under the Balšići and Crnojevići, Lombard Negroponte, Acciaioli Athens, the Livonian prince-bishoprics of Riga and Ösel–Wiek, the prince-bishops of Montenegro, the wartime Slovak Republic and post-war Poland before 1953. Few of these frontiers were ever surveyed.