Prussian Crusade in the context of "Prussia (state)"

The Northern Crusades or Baltic Crusades were military campaigns undertaken by Catholic Christian military orders and kingdoms in an effort to Christianize the pagan Baltic, Finnic, and West Slavic peoples around the southern and eastern shores of the Baltic Sea. In some cases, such as with the Wendish Crusade, the campaign was partly motivated to control the rich resources found in the lands.

The most notable of these campaigns were the Livonian and Prussian Crusades. Some of these wars were explicitly regarded, during the Middle Ages, as crusades; for example, the military venture against the Estonians—and the "other pagans in those parts"—authorized by Pope Alexander III's 1171 crusade bull, Non parum animus noster. However, others—such as the (possibly mythical) 12th-century First Swedish Crusade and several subsequent incursions, undertaken by Scandinavian Christians against the then-pagan Finns—were dubbed "crusades" only in the 19th century, by romantic nationalist historians.

Prussia (/ˈprʌʃə/; German: Preußen [ˈpʁɔʏsn̩] ; Old Prussian: Prūsija) was a German state centred on the North European Plain that originated from the 1525 secularization act of the Prussian part of the State of the Teutonic Order. For centuries, the House of Hohenzollern ruled Prussia, expanding its size with the Prussian Army. Prussia, with its capital at Königsberg and then, when it became the Kingdom of Prussia in 1701, Berlin, decisively shaped the history of Germany. Prussia formed the German Empire when it united the German states in 1871. It was de facto dissolved by an emergency decree transferring powers of the Prussian government to German Chancellor Franz von Papen in 1932 and de jure by an Allied decree in 1947.

The name Prussia derives from the Old Prussians who were conquered by the Teutonic Knights – an organized Catholic medieval military order of German crusaders – in the 13th century. In 1308, the Teutonic Knights conquered the region of Pomerelia with Danzig. Their monastic state was mostly Germanised through immigration from central and western Germany, and, in the south, it was Polonised by settlers from Masovia. The imposed Second Peace of Thorn (1466) split Prussia into the western Royal Prussia, a province of Poland, and the eastern Duchy of Prussia, a feudal fief of the Crown of Poland until 1657. After 1525, the Teutonic Order relocated their headquarters to Mergentheim, but managed to keep land in Livonia until 1561. The union of Brandenburg and the Duchy of Prussia in 1618 led to the proclamation of the Kingdom of Prussia in 1701.

Rudolf of Habsburg (1 May 1218 – 15 July 1291) was a German nobleman and the first member of the House of Habsburg to become King of the Romans, reigning from 1273 until his death. Born into a relatively minor noble family, Rudolf succeeded his father as Count of Habsburg in 1240, gradually expanding his power through military campaigns, political alliances, and the construction of key fortresses such as Neuhabsburg Castle. His marriage to Gertrude of Hohenberg further strengthened his position among the Swabian nobility. During the turbulent period of the Great Interregnum, Rudolf distinguished himself both as a formidable military leader—participating in regional conflicts and even joining the Prussian Crusade in 1254—and as a restorer of order, often intervening against robber barons and feuding nobles. Despite facing excommunication due to disputes with the Church, Rudolf ultimately reconciled with ecclesiastical authorities and built a reputation for fairness and pragmatism. In 1273, he was elected King of the Romans, ending decades of imperial vacancy and division. As king, Rudolf reasserted imperial authority in Germany, notably defeating King Ottokar II of Bohemia and securing Habsburg control over Austria, Styria, and Carinthia. His reign laid the foundations for the rise of the Habsburg dynasty, which would become one of the most influential royal houses in European history. Rudolf died in 1291, leaving a legacy of restored stability and dynastic ambition within the Holy Roman Empire.

The Lithuanian Crusade was a series of campaigns by the Teutonic Order and the Livonian Order under the pretext of forcibly Christianizing the pagan Grand Duchy of Lithuania. The Livonian Order occupied Riga in 1202 and in the 1230s they settled in Chełmno Land, a fief of Poland. They first conquered other neighboring Baltic tribes— proto-Latvians (Curonians, Semigallians, Latgalians, Selonians) and Old Prussians—in the Livonian Crusade and Prussian Crusade.

The first raid against the Lithuanians and Samogitians was in 1208. From then on, the orders played a key role in Lithuanian politics, but they were not a direct threat until the 1280s. By that time, the Grand Duchy of Lithuania was already a centralized state and could mount defenses. For the next century, the order organized annual colonialist reise (raids) into Samogitian and Lithuanian lands, without great success but at immense human cost. Border regions in Samogitia and Suvalkija became sparsely inhabited wilderness due to ethnic cleansing, although the order gained very little territory. The resulting wars between the Teutonic Order and Lithuania were one of the longest conflicts in the history of Europe.

Prussian mythology is the account of what is known of the polytheistic religion of the Old Prussians, indigenous peoples of Prussia before the Prussian Crusade waged by the Teutonic Knights. This archaic Indo-European religion was closely related to other Baltic faiths, namely those of the Lithuanians and Latvians. Its myths and legends did not survive because the Old Prussian people became Germanized and their culture became extinct in the early 18th century. Fragmentary information on gods and rituals can be found in various medieval chronicles, but most of this is unreliable. No sources document pagan religion before the forced Christianization in the 13th century. Most of what is known about Prussian religion has been recovered from dubious 16th-century sources (Sudovian Book and Simon Grunau).

Chronicon terræ Prussiæ (lit. 'Chronicle of the Prussian Land') is a chronicle of the Teutonic Knights, by Peter of Dusburg, finished in 1326. The manuscript is the first major chronicle of the Teutonic Order in Prussia and the Grand Duchy of Lithuania, completed some 100 years after the conquest of the crusaders into the Baltic region. It is a major source for information on the Order's battles with Old Prussians and Lithuanians.