The Kingdom of Poland ( ; , Korolevstvo Polskoye, Tsarstvo Polskoye, , , translation: Tsardom of Poland), informally known as Congress Poland ( or Russian Poland), created in 1815 by the Congress of Vienna, was a personal union of the Russian part of Poland with the Russian Empire. It was gradually politically integrated into Russia over the course of the 19th century, made an official part of the Russian Empire in 1867, and finally replaced during the Great War by the Central Powers in 1915 with the theoretically existing Regency Kingdom of Poland.