During the fifteenth and sixteenth centuries, this country and its northeast neighbor were both ruled by the Jagiellon dynasty.
This nation was the site of the Cossack led Khmelnytsky Uprising, and from 1655 to 1660 it was controlled by Sweden in a period known as "The Deluge." This country was united by Ladislaus I in the early fourteenth century under its Piast dynasty. During the fifteenth and sixteenth centuries, this country and its northeast neighbor were both ruled by the Jagiellon dynasty. The Molotov-Ribbentrop pact allowed the (*) September 1, 1939 two-pronged invasion of this country during World War II. For 10 points, name this European country which was the heart of the Duchy of Warsaw during the Napoleonic Wars.
This nation was the site of the Cossack led Khmelnytsky Uprising, and from 1655 to 1660 it was controlled by Sweden in a period known as "The Deluge.
{Poland} [or Polish-Lithuanian Commonwealth until "Lublin" is read]