Prussia
Teutonic Order

In 1211 King Andrew II of Hungary granted Burzenland in Transylvania as a fiefdom to the Teutonic Knights, a German military order of crusading knights, headquartered in the Kingdom of Jerusalem at Acre. In 1225 he expelled them, and they transferred their operations to the Baltic Sea area. Konrad I, the Polish Duke of Masovia, had unsuccessfully attempted to conquer pagan Prussia in crusades in 1219 and 1222. In 1226 Duke Konrad invited the Teutonic Knights to conquer the Baltic Prussian tribes on his borders.

During 60 years of struggles against the Old Prussians, the Order established an independent state that came to control Prūsa. After the Livonian Brothers of the Sword joined the Teutonic Order in 1237, the Order also controlled Livonia (now Latvia and Estonia). Around 1252 they finished the conquest of the northernmost Prussian tribe of the Skalvians as well as of the western Baltic Curonians, and erected Memel Castle, which developed into the major port city of Memel. The Treaty of Melno defined the final border between Prussia and the adjoining Grand Duchy of Lithuania in 1422.

The Hanseatic League officially formed in northern Europe in 1356 as a group of trading cities. This League came to hold a monopoly on all trade leaving the interior of Europe and Scandinavia and on all sailing trade in the Baltic Sea for foreign countries.

In the course of the Ostsiedlung (German eastward expansion) process, settlers were invited, bringing changes in the ethnic composition as well as in language, culture, and law of the eastern borders of the German lands. As a majority of these settlers were Germans, Low German became the dominant language.

The Knights of the Teutonic Order were subordinate to the papacy and to the Holy Roman Emperor. Their initially close relationship with the Polish Crown deteriorated after they conquered Polish-controlled Pomerelia and Danzig in 1308. Eventually, Poland and Lithuania, allied through the Union of Krewo (1385), defeated the Knights in the Battle of Grunwald (Tannenberg) in 1410.

The Thirteen Years' War (1454–1466) began when the Prussian Confederation, a coalition of Hanseatic cities of western Prussia, rebelled against the Order and requested help from the Polish king, Casimir IV Jagiellon. The Teutonic Knights were forced to acknowledge the sovereignty of, and to pay tribute to Casimir IV in the Second Peace of Thorn (1466), losing western Prussia (Royal Prussia) to Poland in the process. Pursuant to the Second Peace of Thorn, two Prussian states were established.

During the period of the monastic state of the Teutonic Knights, mercenaries from the Holy Roman Empire were granted lands by the Order and gradually formed a new landed Prussian nobility, from which the Junkers would evolve to take a major role in the militarization of Prussia and, later, Germany.
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