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Christianization of Scandinavia

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Through Christianity and England

The earliest signs of Christianization were in the 830s with Ansgar's construction of churches in Birka and Hedeby. The conversion of Scandinavian kings occurred over the period 960–1020. Subsequently, Scandinavian kings sought to establish churches, dioceses and Christian kingship, as well as destroy pagan temples. Denmark was the first Scandinavian country to Christianize, as Harald Bluetooth declared this around AD 965, and raised the larger of the two Jelling Stones. According to historian Anders Winroth, Christianity was not forced upon Scandinavians by foreign states or foreign missionaries, but instead willfully adopted by Scandinavian kings who saw the religion as politically advantageous.

Although the Scandinavians became nominally Christian, it took considerably longer for actual Christian beliefs to establish themselves among the people in some regions, while the people were Christianized before the king in other regions. During the Early Middle Ages the papacy had not yet manifested itself as the central Roman Catholic authority, thus making it possible for regional variants of Christianity to develop.

Mission of Hamburg-Bremen

Recorded missionary efforts in Denmark started with Willibrord, Apostle to the Frisians, who preached in Schleswig, which at the time was part of Denmark. He went north from Frisia sometime between 710 and 718 during the reign of King Ongendus. Willibrord and his companions had little success: the king was respectful but had no interest in changing his beliefs. Agantyr did permit 30 young men to return to Frisia with Willibrord. Perhaps Willibrord's intent was to educate them and recruit some of them to join his efforts to bring Christianity to the Danes. A century later Ebbo, Archbishop of Reims and Willerich, later Bishop of Bremen, baptized a few persons during their 823 visit to Denmark. He returned to Denmark twice to proselytize but without any recorded success.

In 826, the King of Jutland Harald Klak was forced to flee from Denmark by Horik I, Denmark's other king. Harald went to Emperor Louis I of Germany to seek help getting his lands in Jutland back. Louis I offered to make Harald Duke of Frisia if he would give up the old gods. Harald agreed, and his family and the 400 Danes with him were baptized in Ingelheim am Rhein. When Harald returned to Jutland, Emperor Louis and Ebbo of Rheims assigned the monk Ansgar to accompany Harald and oversee Christianity among the converts. When Harald Klak was forced from Denmark by King Horik I again, Ansgar left Denmark and focused his efforts on the Swedes. Ansgar traveled to Birka in 829 and established a small Christian community there. His most important convert was Herigar, described as a prefect of the town and a counselor to the king. In 831 the Archdiocese of Hamburg was founded and assigned responsibility for proselytizing Scandinavia.

Horik I sacked Hamburg in 845 where Ansgar had become the archbishop. The seat of the archdiocese was transferred to Bremen. In the same year there was a pagan uprising in Birka that resulted in the martyrdom of Nithard and forced the resident missionary Bishop Gautbert to flee. Ansgar returned to Birka in 854 and Denmark in 860 to reestablish some of the gains of his first visits. In Denmark he won over the trust of then-King Horik II (not Horik I, who was murdered in 854 and opposed Christianity) who gave him land in Hedeby (proto-town to be replaced by Schleswig) for the first Christian chapel. A second church was founded a few years later in Ribe on Denmark's west coast. Ribe was an important trading town, and as a result, southern Denmark was made a diocese in 948 with Ribe as its seat, a part of the Archdiocese of Hamburg-Bremen under its first bishop, St. Leofdag who was murdered that year while crossing the Ribe River.

The supremacy of the archdiocese of Hamburg-Bremen over ecclesiastical life in the north gradually declined as the papacy, from the pontificate of Pope Gregory VII onwards, involved itself more with the North directly. A significant step in this direction was the foundation of an archbishopric for the whole of Scandinavia at Lund in 1103–04.

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