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.
Zdzisław Lubomirski
On November 5, 1916, the emperors of Germany and Austria-Hungary issued the so-called Act of 5th November, in which they promised an independent Polish state (see also Kingdom of Poland (1916–18)). A year later, on September 16, 1917, the Germans created a provisional government of Poland, the Regency Council, led by Prince Lubomirski, one of its three members along with Archbishop Aleksander Kakowski, and Józef Ostrowski. The Council had its first meeting at Warsaw's Royal Castle on October 27, 1917.