History of Poland
The Polish People's Republic ("Polska Rzeczpospolita Ludowa") was established under the rule of the communist Polish United Workers' Party (PZPR). The name change from the Polish Republic was not officially adopted, however, until the proclamation of the Constitution of the Polish People's Republic in 1952.
Kingdom of Poland (1917–1918)
In the meantime, General von Beseler had managed to gain support among pro-Austrian Poles and the followers of Józef Piłsudski. The Narodowa Demokracja party (centred in Paris), however, rejected any cooperation with the Central Powers. After the German Emperor and Chancellor met with a Polish delegation led by Józef Brudziński, the final details were arranged. On November 5, 1916, Governor von Beseler at Warsaw issued an Act of November 5, in which he promised that a Polish state would be created, without specifying any future Polish ruler, Polish borders or system of governance and, for the first time since 1831, had the Royal Castle decorated with Polish flags. The Austrian Governor-General Kuk issued a similar proclamation at Lublin. A pro-German faction led by Władysław Studnicki existed but didn't gain any significant backing among Polish population.