1915Area1815128,500 km2 (49,600 sq mi)Population• 18153,200,000• 18979,402,253CurrencyPolish złoty(1815–1841)Polish rubel(1841–1915)ISO 3166 codePLPreceded bySucceeded byDuchy of Warsaw1867Vistula Land1915Government General of Warsaw1917Regency Kingdom of PolandToday part ofBelarusLithuaniaPolandCongress Poland[3] or Russian Poland, formally known as the Kingdom of Poland,[4] was a politycreated in 1815 by the Congress of Vienna as a semi-autonomous Polish state and successor toNapoleon's short-lived Duchy of Warsaw. It was established in the Russian sector after Poland waspartitioned by the Habsburg Monarchy, Russia and Prussia. In 1915, during World War I, it wasreplaced by the Central Powers with the nominal Regency Kingdom of Poland,[a] until Polandregained independence in 1918.