The Livonian Crusade refers to the German and Danish conquest of medieval Livonia, the territory constituting modern Latvia and Estonia, during the Northern Crusades. The lands on the eastern shores of the Baltic Sea were the last corners of Europe to be Christianized.
On 2 February 1207, in the territories conquered, an ecclesiastical state called Terra Mariana was established as a principality of the Holy Roman Empire, and proclaimed by Pope Innocent III in 1215 as a subject of the Holy See.
War against Livs and Latgalians (1198–1209)
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Christianity had come to Latvia with the Swedes in the 9th century and the Danes in the 11th. By the time German traders began to arrive in the second half of the 12th century to trade along the ancient Daugava-Dnieper route to Byzantium, many Latvians had already been baptized. Meinhard of Segeberg arrived in Livland (as it was named in German) in 1184 with the mission of converting the pagan Livonians, and was consecrated as its bishop in 1186.
The indigenous Livonians (Livs), who had been paying tribute to the East Slavic Principality of Polotsk, and were often under attack by their southern neighbours the Semigallians, at first considered the Low Germans (Saxons) to be useful allies. The first prominent Livonian to be converted was their leader Caupo of Turaida, who was baptized around 1189.
Pope Celestine III called for a crusade against pagans in Northern Europe in 1193. When peaceful means of conversion failed to produce results, the impatient Meinhard plotted to convert the Livonians forcibly, but was thwarted. He died in 1196, having failed his mission. His appointed replacement, bishop Berthold of Hanover, arrived with a large contingent of crusaders in 1198. Shortly afterward, while riding ahead of his troops in battle, Berthold was surrounded and killed, and his forces defeated.
To avenge Berthold's defeat, Pope Innocent III issued a bull declaring a crusade against the Livonians. Albrecht von Buxthoeven, consecrated as bishop in 1199, arrived the following year with a large force, and established Riga as the seat of his bishopric in 1201. In 1202 he formed the Livonian Brothers of the Sword to aid in the conversion of the pagans to Christianity and, more importantly, to protect German trade and secure German control over commerce.
As the German grip tightened, the Livonians and their christened chief rebelled against the crusaders. Caupo's forces were defeated at Turaida in 1206, and the Livonians were declared to be converted. Caupo subsequently remained an ally of the crusaders until his death in the Battle of St. Matthew's Day in 1217.
By 1208 the important Daugava trading posts of Salaspils (Holme), Koknese (Kokenhusen) and Sēlpils (Selburg) had been taken over as a result of Albert's energetic campaigning. In the same year, the rulers of the Latgalian counties Tālava, Satekle, and Autine established military alliances with the Order, and construction began on both Cēsis (Wenden) castle and a stone castle in Koknese, where the Daugava and Pērse rivers meet, replacing the wooden castle of the Latgalians. In 1209 Albert, leading the forces of the Order, captured the capital of the Latgalian principality of Jersika, and took the wife of the ruler Visvaldis captive. Visvaldis was forced to submit his kingdom to Albert as a grant to the Archbishopric of Riga, and received back only a portion of it as a fief. Tālava, weakened in wars with Estonians and Russians, became a vassal state of the Archbishopric of Riga in 1214, and in 1224 was finally divided between the Archbishopric and the Order.
War against Estonians (1208–1227)
By 1208 the Crusaders were strong enough to begin operations against the Estonians, who were at that time divided into eight major and seven smaller Counties, led by elders, with limited co-operation between them. With the help of the newly converted local tribes of Livs and Latgalians, the crusaders initiated raids into Sakala and Ugaunia in Southern Estonia. The Estonian tribes fiercely resisted the attacks from Riga and occasionally sacked territories controlled by the crusaders. In 1208–27, war parties of the different sides rampaged through Livonia, Latgalia, and other Estonian counties, with the Livs, Latgalians and Russians of the Republic of Novgorod serving variously as allies of both crusaders and Estonians. Hill forts, which were the key centers of Estonian counties, were besieged, captured, and re-captured a number of times. A truce between the war-weary sides was established for three years (1213–1215). It proved generally more favourable to the Germans, who consolidated their political position, while the Estonians were unable to develop their system of loose alliances into a centralised state. They were led by Lembitu of Lehola, the elder of Sackalia, who by 1211 had come to the attention of German chroniclers as the central figure of the Estonian resistance. The Livonian leader Caupo was killed in the Battle of St. Matthew's Day near Viljandi (Fellin) on September 21, 1217, but Lembitu was also killed, and the battle was a crushing defeat for the Estonians.
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The Christian kingdoms of Denmark and Sweden were also eager for expansion on the eastern shores of the Baltic. In 1218 Albert asked King Valdemar II of Denmark for assistance, but Valdemar instead arranged a deal with the Order. The king was victorious in the Battle of Lyndanisse in Revelia in 1219, to which the origin of the Dannebrog is attributed. He subsequently founded the fortress Castrum Danorum, which was unsuccessfully besieged by the Estonians in 1220 and 1223. King John I of Sweden tried to establish a Swedish presence in the province of Wiek, but his troops were defeated by the Oeselians in the Battle of Lihula in 1220. Revelia, Harrien, and Vironia, the whole of northern Estonia, fell to Danish control.
During the uprising of 1223, all Christian strongholds in Estonia save Tallinn fell into Estonian hands, with their defenders killed. By 1224 all of the larger fortresses were reconquered by the crusaders, except for Tharbata, which was defended by a determined Estonian garrison and 200 Russian mercenaries. The leader of the Russian troops was Vyachko, to whom the Novgorod Republic had promised the fortress and its surrounding lands "if he could conquer them for himself". Tharbata was finally captured by the crusaders in August 1224 and all its defenders killed. Early in 1224 Emperor Frederick II had announced at Catania that Livonia, Prussia, Sambia and a number of neighboring provinces would henceforth be considered reichsfrei, that is, subordinate directly to the Roman Catholic Church and the Holy Roman Empire only, as opposed to being under the jurisdiction of local rulers. At the end of the year Pope Honorius III announced the appointment of Bishop William of Modena as papal legate for Livonia, Prussia, and other countries.
In 1224 the Livonian Brothers of the Sword established their headquarters at Fellin (Viljandi) in Sackalia, where the walls of the Master's castle are still standing. Other strongholds included Wenden (Cēsis), Segewold (Sigulda), and Ascheraden (Aizkraukle). The Chronicle of Henry of Livonia, one of the greatest medieval narratives, was written probably as a report for William of Modena, giving him the history of the Church in Livonia up to his time. It relates how in 1226, in the stronghold Tarwanpe, William of Modena successfully mediated a peace between the Germans, the Danes and the Vironians.
War against Saaremaa (1206–1261)
The last Estonian county to hold out against the invaders was the island country of Saaremaa (Ösel), whose war fleets had continued to raid Denmark and Sweden during the years of fighting against the German crusaders.
In 1206, a Danish army led by king Valdemar II and Andreas, the Bishop of Lund, landed on Saaremaa and attempted to establish a stronghold, without success. In 1216 the Livonian Brothers of the Sword and the bishop Theodorich joined forces and invaded Saaremaa over the frozen sea. The Oeselians retaliated by raiding German-held territories in Latvia the following spring. In 1220 a Swedish army led by king John I of Sweden and the bishop Karl of Linköping captured Lihula in Rotalia in Western Estonia. The Oeselians attacked the Swedish stronghold later the same year and killed the entire garrison, including the Bishop of Linköping.
In 1222, the Danish king Valdemar II attempted a second conquest of Saaremaa, this time establishing a stone fortress housing a strong garrison. The stronghold was besieged and surrendered within five days, the Danish garrison returning to Revel while leaving Bishop Albert of Riga's brother Theodoric and others behind as hostages for peace. The castle was leveled by the Oeselians.
In 1227, the Livonian Brothers of the Sword, the town of Riga, and the Bishop of Riga organized a combined attack against Saaremaa. After the surrender of two major Oeselian strongholds, Muhu and Valjala, the Oeselians formally accepted Christianity.
After the defeat of the Livonian Brothers of the Sword in the Battle of Saule in 1236 fighting again broke out on Saaremaa.
In 1241 the Oeselians once again accepted Christianity by signing treaties with the Livonian Order's Master Andreas de Velven and the Bishopric of Ösel-Wiek. This was followed by a treaty signed in 1255 by the Master of the Order, Anno Sangerhausenn, and, on behalf of the Oeselians, elders whose names were phonetically transcribed by Latin scribes as Ylle, Culle, Enu, Muntelene, Tappete, Yalde, Melete, and Cake  The treaty granted the Oeselians several distinctive rights regarding the ownership and inheritance of land, the social order, and the practice of religion.
Warfare erupted in 1261 as the Oeselians once more renounced Christianity and killed all the Germans on the island. A peace treaty was signed after the united forces of the Livonian Order, the Bishopric of Ösel-Wiek, and Danish Estonia, including mainland Estonians and Latvians, defeated the Oeselians by capturing their stronghold at Kaarma. Soon thereafter, the Livonian Order established a stone fort at Pöide.
On July 24, 1343, the Oeselians arose yet again, killing all the Germans on the island, drowning all the clerics, and besieging the Livonian Order's castle at Pöide. After the garrison surrendered the Oeselians massacred the defenders and destroyed the castle. In February 1344 Burchard von Dreileben led a campaign over the frozen sea to Saaremaa. The Oeselians' stronghold was conquered and their leader Vesse was hanged. In the early spring of 1345, the next campaign of the Livonian Order ended with a treaty mentioned in the Chronicle of Hermann von Wartberge and the Novgorod First Chronicle. Saaremaa remained the vassal of the master of the Livonian Order and the Bishopric of Ösel-Wiek until 1559.
Wars against Curonians and Semigallians (1219–1290)
Following the defeat of the Estonians, the crusade moved against the Curonians (1242–1267) and Semigallians (1219–1290), Baltic tribes living to the south and west of the Daugava river and closely allied with the Samogitians.
After the defeat in the Battle of Saule by Samogitians and Semigallians, the remnants of the Livonian Brothers of the Sword were reorganised in 1237, as a subdivision of the Teutonic Order and became known as the Livonian Order. The Battle of Durbe was another victory of Samogitians and allied Curonians over the united forces of Livonian and Teutonic Orders in 1260. Crusaders finally overpowered the Curonians in 1267, and despite of severe defeat in the Battle of Garoza in 1287, subsequently the Semigallians in 1290. The unconquered southern parts of their territories (Sidrabe, Rakte, Ceklis, Megava etc.) were united under the rule of the Grand Duchy of Lithuania.
After the conquest, all remaining local pagans were ostensibly Christianized although no Christian literature or church services became available in native languages until the Protestant Reformation period in the 16th century. The conquerors upheld military control through their network of castles throughout Estonia and Latvia.
The land was divided into six feodal principalities by Papal Legate William of Modena: Archbishopric of Riga, Bishopric of Courland, Bishopric of Dorpat, Bishopric of Ösel-Wiek, the lands ruled by the Livonian Brothers of the Sword and Dominum directum of King of Denmark, the Duchy of Estonia.
In 1227 the Livonian Brothers of the Sword conquered all Danish territories in Northern Estonia. After the Battle of Saule the surviving members of the Brothers of the Sword merged into the Teutonic Order of Prussia in 1237 and became known as Livonian Order. On 7 June 1238 by the Treaty of Stensby the Teutonic knights returned the Duchy of Estonia to Valdemar II, until in 1346, after St. George's Night Uprising, the lands were sold back to the order and became part of the Ordenstaat.
- Battle of Riga (1203)
- Battle of Koknese (1205)
- Battle of Salaspils (1206)
- Battle of Turaida (1206)
- Battle of Saaremaa, 1206
- Battle of Koknese (1208)
- Battle of Otepää (1208)
- Battle of Jersika, 1209
- Battle of Otepää (1210)
- Battle of Cēsis (1210)
- Battle of Ümera, 1210
- Battle of Turaida (1211)
- Battle of Viljandi, 1211
- Battle of Lehola, 1215
- Battle of Riga (1215)
- Battle of Soontagan, 1215
- Battle of Otepää, 1217
- Battle of Soontagan, 1217
- Battle of St. Matthew's Day, 1217
- Battle of Lyndanisse, 1219
- Siege of Mežotne, 1219
- Battle of Lihula, 1220
- Siege of Tallinn, 1221
- Battle of Soela, 1223
- Battle of the Ümera River Bridge, 1223
- Battle of Viljandi (1223)
- Siege of Tallinn (1223)
- Siege of Tartu, 1224
- Battle of Muhu, 1227
- Siege of Aizkraukle (1229)
- Battle of Saule, 1236
- Battle of Durbe, 1260
- Siege of Tērvete (1259)
- Battle of Tērvete (1270)
- Siege of Dobele (1279)
- Battle of Tērvete (1280)
- Siege of Dobele (1281)
- Battle of Riga (1281)
- Battle of Tērvete (1281)
- Battle of Garoza 1287
- Battle of Dobele (1290)
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- The Baltic Crusade By William L. Urban; p 113–114 ISBN 0-929700-10-4
- Liv-, est- und kurländisches Urkundenbuch: Nebst Regesten
- Harrison, Dick (2005). Gud vill det! - Nordiska korsfarare under medeltid (in Swedish). Ordfront. p. 573. ISBN 978-91-7441-373-1.
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- Knut, Helle (2003). The Cambridge History of Scandinavia: Prehistory to 1520. Cambridge University Press. p. 269. ISBN 0-521-47299-7.