The Teutonic Order: Religion, Mission and Conversion in Prussia and Livonia

The Teutonic Order’s religious mission in the Baltic took shape during the thirteenth century, amid campaigns in Prussia and Livonia, the medieval region corresponding broadly to present-day Latvia and Estonia. The Order began in Acre around 1190 as a hospital brotherhood serving German-speaking pilgrims. It received papal recognition in the early 1190s and became a military order in 1198, with further papal approval in 1199. Its Baltic work therefore joined two purposes: maintaining a religious community and using armed force to defend Christian rule and extend it into territories whose inhabitants had not adopted Catholic Christianity.

Conversion was not a single event. Missionaries preached and baptized, but campaigns also compelled communities to submit, and baptism could form part of a political settlement. Bishops organized dioceses, while the Order and other rulers contested control of land and revenues. Even after a community had accepted Christianity, revolts and repudiations show that baptism did not always mean lasting religious adherence. The details differed between Prussia and Livonia, where missionary work and ecclesiastical institutions were already developing before the Teutonic Order took a leading role.

On this page6 sections

A religious order in a military mission

The Order’s religious and military functions were carried by different members of the same institution. Its brothers included priests and knights, as well as other brothers who worked in economic and healthcare roles. Priest-brothers held clerical responsibilities within the Order; knight-brothers supplied its military force. Bishops, meanwhile, governed dioceses, meaning territories under a bishop’s authority. The Order could lead campaigns and hold land, but it was not the only church authority responsible for Christian organization.

In the Baltic, the distinction between armed conquest and the work of clergy was often blurred in practice. The Teutonic Knights entered Prussia in 1230 at the invitation of Christian rulers seeking military help against the Old Prussians. The stated aim included conversion, but campaigns also established territorial control. In Livonia, a bishop’s mission and the military activities of the Livonian Brothers of the Sword developed together. That order was absorbed into the Teutonic Order in 1237, forming its Livonian branch, which retained considerable autonomy.

Papal authority, bishops and territorial claims

The papacy gave the Baltic campaigns religious and legal authorization. A papal letter of 1199 allowed people who had vowed to travel to the Holy Land to take part in the Livonian crusade instead, with a remission or commutation of penance and papal protection for their property. Participants who took the cross were expected to serve in the campaign for at least a year. In Prussia, Pope Honorius III authorized preaching a crusade in 1217, before the Teutonic Order began its campaigns there.

Imperial and papal grants also shaped claims to conquered territory. Emperor Frederick II’s Golden Bull of Rimini, dated 1226 but with a debated issue date,, granted the Order Chełmno Land as a base and recognized claims to future conquests. Pope Gregory IX’s Golden Bull of Rieti in 1234 affirmed the Order’s control of lands it had conquered, under papal authority. These grants did not remove disputes over who should govern. Bishop Christian of Oliva led the Prussian mission, and disagreements over the division of conquered lands required mediation by the papal legate William of Modena.

Church administration developed alongside these claims. In 1243, Pope Innocent IV and William of Modena divided Prussia into four dioceses, although some of the territory had not yet been conquered. In Livonia, William helped divide Christian-held lands among six principalities, including bishoprics, the Livonian Order’s holdings and the Danish-ruled Duchy of Estonia. The result was not a single church territory under the Teutonic Knights, but a patchwork in which bishops, the Order, Danish rulers and local powers held competing interests.

Prussia: conquest, baptism and resistance

Prussian conversion efforts preceded the Teutonic Order’s arrival. In the early thirteenth century, the Cistercian bishop Christian of Oliva worked to establish a mission, but conflict between Prussians and neighboring Christian rulers undermined it. After the Order began campaigning in 1230, it relied on fortifications, seasonal crusading reinforcements and support from Polish and Pomeranian rulers. Many visiting crusaders returned home after a campaign, leaving the Order to hold its gains and maintain its castles.

Submission and baptism could occur together. When the Sambians surrendered in 1255, the garrison of a captured stronghold accepted baptism. Baptism accompanied the stronghold’s military submission. The Treaty of Christburg, concluded in 1249 after the First Prussian Uprising, offered civil liberties and considerable autonomy to native converts. Fighting nevertheless continued, and the Great Prussian Uprising began in 1260. In its aftermath, many Prussians lost rights, some fled to neighboring Lithuania, and others were forcibly moved. The Order’s control was consolidated through further campaigns by the end of the thirteenth century, but Christianization and cultural change continued over a longer period.

For Prussian communities, the terms of conversion were therefore bound up with political status. Treaties could recognize rights for converts, while military defeat could weaken those protections. The Order’s religious claims and its government of conquered territory were closely connected: baptism might mark submission, but the lasting organization of Christian communities depended on clergy, local agreements and the continuing ability to enforce the new order.

Livonia: an older mission and a changing crusade

In Livonia, Catholic missionary activity began before the Teutonic Order’s Baltic expansion. Meinhard arrived among the Livonians in 1184 and established a mission at Ikšķile; he was consecrated bishop in 1186. He built churches and sought to encourage conversion, in some cases linking baptism to promises of protection and the construction of stone fortifications. Some people who accepted baptism later returned to their earlier beliefs. After Meinhard’s death, Bishop Berthold arrived with crusaders and was killed in fighting in 1198. His successor, Albert of Buxhoeveden, established Riga as his bishopric’s center in 1201 and founded the Livonian Brothers of the Sword the following year.

Livonian conversion involved local leaders and communities as well as foreign clergy and soldiers. Caupo, a Livonian leader baptized around 1189, became an ally of the crusaders, while other Livonians resisted their expanding authority. In 1206, a Livonian revolt against the bishop’s forces was defeated. Livonian converts subsequently served the Christian rulers, including in military campaigns. Their cooperation could offer protection or advantages against neighboring powers, but it also carried obligations and occurred within a struggle over local independence.

The region was not divided simply between Catholic Christians and pagans. Rulers in Jersika and Koknese belonged to eastern Christianity, and relations with them involved political conflict as well as religious difference. Other local groups made alliances with the crusaders at some times and opposed them at others. Estonia, Courland and the islands also experienced resistance and negotiated submission. On Saaremaa, for example, the inhabitants accepted Christianity after a campaign in 1227, renewed their agreement in 1241, and rose again in 1261. Repeated uprisings renewed the conflict over the islanders’ political obligations as well as religious observance.

Churches, priests and parish organization

Dioceses gave bishops a structure for organizing the church in lands being brought under Christian rule. Parishes, the local communities served by a church and its clergy, formed a more immediate setting for religious life. The evidence for how quickly such local structures developed is uneven, but agreements and church divisions reveal practical expectations: communities were to support priests, maintain churches and meet obligations to their new rulers.

In Courland, agreements made during the subjugation of the Curonians specified the construction of eleven churches in the north of the region. Other terms required payment of dues to rulers and clergy and participation in Christian military campaigns. These provisions show that conversion could involve more than baptism: it could reshape taxation, service and local access to clergy. The agreements assigned communities responsibility for supporting the new churches and their clergy.

Some agreements also set out protections and rights. A 1255 treaty with leaders of Saaremaa addressed land ownership and inheritance, social arrangements and religious practice. Such terms reflect negotiation within a relationship shaped by military defeat and pressure, with different terms negotiated in each setting. The evidence supports a gradual, contested development of church institutions rather than a simple transition from conquest to settled parish life.

From Baltic crusades to the end of territorial rule

The conversion of Lithuania changed the justification for further crusading. Grand Duke Jogaila was baptized in 1386, and an official Catholic conversion programme began in Lithuania in 1387, although conflict between Lithuania, Poland and the Teutonic Order continued. In Prussia, the Order’s territorial rule ended in 1525 when Grand Master Albert of Brandenburg secularized its remaining lands and established the Duchy of Prussia. In Livonia, the branch’s territorial rule ended amid the partition and secularization of its lands in 1561.

The Order continued beyond its Baltic territories, but its history as a military power governing Prussia and Livonia had given way to a different institutional setting. In the Baltic, its conversion mission had been shaped by the interaction of religious purpose, papal and episcopal authority, local political choices, armed conquest and the slow work of building churches and Christian communities.