The Polish Commonwealth is a nation in Eastern Europe. Also known as the Polish-Lithuanian Commonwealth, its population is made up of three major groups: Poles, Ruthenians (ancestors of Ukrainians and Belarusians), and Lithuanians. The minority groups were non-Lithuanian Balts and Jews. The Polish Commonwealth is famed for its majestic Winged Hussars. While it possesses a powerful army, it is fragile due to its dissatisfied gentry, which could ultimately lead to the Polish Commonwealth's demise. The Deluge is the main questline for the Polish Commonwealth.