At one point it covered 400,000 square miles and was the largest country in Europe. According to Steven Seegel, in his 2012 “Mapping Europe’s Borderlands,” it “…comprised parts of 14 Central and East European countries — Austria, Belarus, the Czech Republic, Estonia, Germany, Hungary, Russia’s Kaliningrad Oblast, Latvia, Lithuania, Moldova, Poland, Romania, Russia, the Slovak Republic, and Ukraine…” In 2010, Richard Butterwick, in Central Europe, Vol. 8 No. 2, wrote of “…the successor states, nations, and nation-states of the Grand Duchy of Lithuania: Lithuania, Belarus, Ukraine, Latvia, Poland, Russia, and Israel (to name but the principal ones).” My focus here is the area represented today by the three Baltic republics, eastern Poland, the Kaliningrad Oblast, and Belarus — if you or your ancestors are from these areas, you will find maps here of interest.