So your ancestors are listed in records as “Prussian,” but you can’t find Prussia on modern maps of Europe. What gives? Before being absorbed into Germany, “Prussia” (German: Preussen) was a major military and economic power in Central Europe during the 18th and 19th centuries. Let’s take a look at Prussian history to see what we can learn about your Prussian ancestors.
First of all: Where was Prussia? At its peak, Prussia included half of modern Poland and all but southern Germany, including: West Prussia, East Prussia, Brandenburg (including Berlin), Saxony, Pomerania, the Rhineland, Westphalia, non-Austrian Silesia, Lusatia, Schleswig-Holstein, Hanover, and Hesse-Nassau. The Duchy of Prussia (the eastern-most portion of Prussia) comprised the medieval lands conquered by Teutonic Knights. The region became part Brandenburg-Prussia in the 17th century, and the Kingdom of Prussia in 1701.
Prussia grew in size and influence throughout the 18th and 19th centuries by jockeying with other European powers (particularly Austria). Notably, Prussia conquered Austrian-held Silesia and set off the decisive Seven Years’ War by invading Bohemia. Though the Napoleonic Wars brutalized central Europe, Prussia gained sizable territory at the wars’ end. Following the Congress of Vienna, Prussia annexed large sections of the Holy Roman Empire (another now-defunct state).
Prussia also benefited from another result of the Congress of Vienna: the German Confederation. The loose affiliation of German-speaking city-states didn’t include Prussia, but Prussia exerted its influence over the region. Prussia established a trade union with the Confederation states that excluded Austria, allowing Prussia to edge out its rival to become the dominant German-speaking state in the region.
In addition, historians recognize Prussia as the predecessor to a unified German state. Otto Von Bismarck, Prussia’s prime minister, was instrumental in Germany’s creation. Seeing an opportunity to expand Prussian influence (and dreaming of a unified German empire), Bismarck seized territory through wars with Denmark and Austria. He also declared a new alliance among Prussia and the German states, called the North German Confederation (1867–1871). After goading France into war and (quickly winning), Bismark negotiated a unified German Empire in 1871. Prussia remained the dominant power in the German Empire until its dissolution in 1918 after World War I.
Because of Prussia’s prominence in German history, you can often find the same resources for Prussian ancestors as you would for your “German” ancestors. You can find a list of online resources specifically for Prussian ancestry on the FamilySearch Wiki.