Northern Crusades
Pope Celestine III issued a formal call for crusade in 1195, marking the official start of Northern Crusades. This papal bull authorized military action against Baltic pagans, framing it as equivalent to campaigns in the Holy Land. Earlier efforts had begun without such explicit mandates. The Wendish Crusade started in 1147, targeting Polabian Slavs between the Elbe and Oder rivers. Germanic kingdoms sought control over rich resources found in these northern territories. Economic advantage drove many conflicts alongside religious conversion goals. Christian monarchs across northern Europe commissioned expeditions into modern-day Estonia, Finland, Latvia, Lithuania, Poland, and Russia. Indigenous populations faced forced baptisms and military occupation during these campaigns.
The Wendish Crusade began in 1147 with attacks on Polabian Slavs by Saxons, Danes, and Poles. These campaigns continued irregularly until the 16th century, running parallel to the Second Crusade to the Holy Land. Swedish forces launched their first known expedition against Finns in the 1150s. Danish crusader Esbern Snare mentioned a major victory over Finns during his Christmas-feast speech in 1187. King Knut Waldemarsson led an expedition to Finland in 1191 that sources describe as victorious. Bishop Anders Sunesen conducted operations in 1202, though historical records about this campaign remain sparse. Rivalry between Danish and Swedish churches fueled competition for converts and territory. Sweden experienced internal civil strife from House of Sverker versus House of Erik during the mid-1100s to early 1200s. The Pope changed his preference regarding Finnish areas in 1216, placing them under Swedish protection instead of Danish control.
Bishop Albert of Buxhoeveden arrived at the Daugava river mouth in 1200 with only 23 ships and 500 soldiers. He founded the Livonian Brothers of the Sword in 1202 to ensure permanent military presence. The order established market at Riga in 1201, attracting citizens from across the Empire. Pope Innocent III dedicated Baltic countries to Virgin Mary, creating name Terra Mariana or Land of Mary. Crusaders subdued Livonian stronghold Turaida on Gauja River right bank in 1206. Stone castle built in Sigulda before 1210 controlled left bank of the river. Last battle against Livonians occurred as siege of Satezele hillfort near Sigulda in 1212. Caupo of Turaida became first prominent Livonian leader christened by Germans. He remained ally until death in Battle of St. Matthew's Day in 1217. German crusaders enlisted newly baptized Livonian warriors for campaigns against Latgallians, Estonians, Semigallians, Samogitians, and Curonians between 1208 and 1290.
King Valdemar II of Denmark landed his fleet at Lindanisse, present-day Tallinn, in June 1219. After winning Battle of Lindanise, Danes established fortress that withstood sieges by Estonians in 1220 and 1223. Northern Estonia eventually came under Danish control following these military operations. Danish army led by King Valdemar II and Andreas Bishop of Lund attempted to establish stronghold on Saaremaa island in 1206 but failed. Second conquest attempt in 1222 resulted in stone fortress surrendering within five days after being besieged. Oeselians razed the castle to ground and killed all defenders except hostages left behind. A 20,000 strong army under Papal legate William of Modena crossed frozen sea in January 1227 when Saaremaa fleet was icebound. Two major Oeselian strongholds Muhu and Valjala surrendered, leading to formal Christian acceptance by islanders. Warfare continued as Oeselians renounced Christianity again in 1261 before final defeat at Kaarma stronghold.
Duke Konrad I of Masovia invited Teutonic Knights to Prussia in 1226 to suppress Old Prussians. The order originated as hospital in Acre around 1190 before becoming military force in 1198. Significant expedition began in 1234 with Polish forces defeating Old Prussians on Dzierzgoń river. Livonian Brothers of Sword remnants incorporated into Teutonic Order in 1237 after Battle of Saule defeat. This created autonomous Livonian branch exercising political control over large Baltic territories. Mindaugas ruler of Lithuania baptized wife around 1251 and crowned King in 1253 hoping to stop attacks. Formal conversion of Lithuania commenced in 1387 following marriage of Grand Duke Jogaila to Queen Jadwiga of Poland. Conflict persisted until pivotal Battle of Grunwald in 1410 where allied Polish-Lithuanian forces decisively defeated Teutonic Knights. Tatar, Moldovan, Ruthenian, and Czech contingents supported the winning side during this engagement.
Estonians divided into eight major counties led by elders maintained limited cooperation throughout conflict period. Hillforts served as key centers for Estonian counties and were besieged multiple times. Truce established between war-weary sides lasted three years from 1213 to 1215 favoring Germans politically. Estonian leader Lembitu became central figure of resistance after appearing in German chroniclers' records since 1211. He died alongside Livonian leader Kaupo near Viljandi on the 21st of September 1217. Oeselians raided Latvian territories under German rule following invasions over frozen sea in 1216. Swedish garrison including Bishop Karl of Linköping killed entirely when Oeselians attacked Lihula stronghold in 1220. Semigallians rebelled again in 1279 under Duke Nameisis after capital hillfort Tērvete conquered in 1271. Lithuanians under Traidenis defeated Livonian Order forces at Battle of Aizkraukle that same year. At least 35 knights lost lives along with Orders master Villekin during Battle of Garoza in 1287.
Northern Crusades created lasting cultural impact across Baltic region through centuries of warfare and conversion efforts. Some campaigns like First Swedish Crusade dubbed as crusades only in 19th century by romantic nationalist historians. Peaceful subjugation occurred uniquely with Latgallian Principality of Tālava converting from Greek Orthodoxy to Roman Catholicism in 1208. Ruler Tālivaldis became most loyal ally against Estonians before dying Catholic martyr in 1215. Trade embargoes targeted Novgorodians around 1229-1237 following Papal requests regarding threats to Christianity in Finland. Battle of the Ice in 1242 halted eastward expansion into Russian principalities when Novgorod forces defeated Livonian branch. Region remained under complex political control of Livonian Confederation including Livonian Order and Prince-Bishops until modern times. Nationalist reinterpretations have shaped historical memory differently across Estonia, Latvia, Lithuania, Poland, and Germany throughout subsequent centuries.
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Common questions
When did the Northern Crusades officially begin according to Pope Celestine III?
Pope Celestine III issued a formal call for crusade in 1195, marking the official start of Northern Crusades. This papal bull authorized military action against Baltic pagans and framed it as equivalent to campaigns in the Holy Land.
Who founded the Livonian Brothers of the Sword and when did they arrive at Daugava river mouth?
Bishop Albert of Buxhoeveden arrived at the Daugava river mouth in 1200 with only 23 ships and 500 soldiers. He founded the Livonian Brothers of the Sword in 1202 to ensure permanent military presence.
What happened during the Battle of Grunwald in 1410 involving Teutonic Knights?
Conflict persisted until pivotal Battle of Grunwald in 1410 where allied Polish-Lithuanian forces decisively defeated Teutonic Knights. Tatar, Moldovan, Ruthenian, and Czech contingents supported the winning side during this engagement.
How many knights died during the Battle of Garoza in 1287 under Order master Villekin?
At least 35 knights lost lives along with Orders master Villekin during Battle of Garoza in 1287. Semigallians rebelled again in 1279 under Duke Nameisis after capital hillfort Tērvete conquered in 1271.
When did the Wendish Crusade start and which groups attacked Polabian Slavs?
The Wendish Crusade began in 1147 with attacks on Polabian Slavs by Saxons, Danes, and Poles. These campaigns continued irregularly until the 16th century, running parallel to the Second Crusade to the Holy Land.