The Norwegian Civil War Era (1130–1240)
The Norwegian Civil War Era (Norwegian: borgarkrigstida) lasted from 1130 to 1240 and marked one of the most turbulent periods in Norway’s medieval history. Over a century of intermittent warfare saw more than twenty rival kings and claimants compete for the throne. The conflict arose largely from unclear succession rules, shifting alliances, and competing ideas of legitimacy, eventually giving rise to organized political factions and contributing to the emergence of a stronger centralized monarchy.
Origins of the Conflict
At the time, Norway lacked formal laws regulating royal succession. Any male descendant of King Harald Fairhair, whether legitimate or illegitimate, could claim kingship. To prevent conflict, rival claimants often attempted to rule jointly or negotiate rotating successions. While these arrangements sometimes preserved temporary peace, they were fragile and prone to collapse.
The civil wars began after the death of King Sigurd the Crusader in 1130. Sigurd had previously reached an agreement with Harald Gille, who claimed to be Sigurd’s half-brother, that Harald would not pursue kingship during Sigurd’s lifetime or that of his son Magnus. Upon Sigurd’s death, Harald broke this oath and claimed the throne, igniting the first major armed conflict.
Early Power Struggles (1130–1139)
Magnus, Sigurd’s son, was proclaimed king, but Harald Gille secured strong backing and forced a power-sharing arrangement. Hostilities resumed in 1134. Harald captured Magnus in Bergen, had him blinded and mutilated, and confined him to a monastery, earning Magnus the epithet “the Blind.”
Soon afterward, another claimant, Sigurd Slembe, arrived claiming royal descent. After murdering Harald Gille in 1136, Sigurd Slembe attempted to seize power. Harald’s supporters responded by proclaiming Harald’s young sons, Sigurd Munn and Inge Crouchback, as kings. Sigurd Slembe allied himself with Magnus the Blind, but both were defeated at the Battle of Holmengrå in 1139. Magnus was killed, and Sigurd Slembe was captured and executed.
The Sons of Harald Gille and the Rise of Factions
Initially, Harald’s sons ruled jointly without major conflict. This arrangement changed in 1142 when Øystein Haraldsson arrived from abroad and was accepted as co-king. The three brothers governed together until rivalries escalated.
In 1155, Sigurd Munn was killed during a meeting arranged by Inge Crouchback. Øystein was later captured and killed in 1157. Supporters of the slain brothers refused to submit to Inge and instead elevated Sigurd Munn’s young son, Håkon the Broadshouldered, as king. This marked a turning point: political groups now persisted beyond the deaths of individual leaders and began selecting new figureheads, laying the groundwork for permanent factions.
Inge himself was killed in battle in 1161, intensifying the struggle.
Magnus Erlingsson and Church Alliance
After Inge’s death, his supporters chose the young Magnus Erlingsson as king. Though not a king’s son through the male line, Magnus gained legitimacy through his mother’s royal descent. His father, Erling Skakke, became the true political power behind the throne.
To strengthen Magnus’s claim, Erling allied with the Church and introduced a new principle: only legitimate sons could inherit the crown. Magnus was crowned in Bergen in 1163, becoming Norway’s first crowned monarch. A written succession law was established, favoring legitimate primogeniture.
For nearly a decade, Erling’s faction maintained dominance through military force and political alliances, including occasional cooperation with Denmark.
Sverre Sigurdsson and the Birkebeiner Movement
In 1174, opposition coalesced around a new movement known as the Birkebeiner, named for their poverty, as some reportedly wrapped birch bark around their legs in place of shoes. After their initial leader was killed, they chose Sverre Sigurdsson as their new commander.
Sverre claimed to be the son of Sigurd Munn, a claim widely doubted even at the time. Nonetheless, he attracted support from discontented groups and challenged Magnus Erlingsson’s regime. Although often portrayed as a champion of the poor, Sverre’s movement primarily sought political power rather than social reform.
Sverre’s forces killed Erling Skakke at the Battle of Kalvskinnet in 1179. After years of warfare, Sverre defeated Magnus Erlingsson in a decisive naval battle at Fimreite in 1184, securing the throne.
Conflict with the Church
Sverre’s reign (1184–1202) was marked by ongoing opposition from the Church, which had supported Magnus Erlingsson. Archbishop Eirik Ivarsson fled Norway and secured papal backing to excommunicate Sverre. In 1198, Pope Innocent III placed Norway under interdict.
Despite this, Sverre maintained political control and forced the coronation of himself by Bishop Nikolas Arnesson in 1194. He ruled until his death in 1202, advising his son Håkon Sverresson to reconcile with the Church.
The Bagler Faction and Renewed Warfare
In 1197, Sverre’s opponents formed the Bagler faction, supported by Church leaders and Danish interests. They elevated Inge Magnusson as their claimant king and resumed war against the Birkebeiner. Neither side achieved decisive victory before Sverre’s death.
After Sverre died, his son Håkon Sverresson briefly ruled and restored relations with the Church. Following his sudden death in 1204, renewed conflict erupted. The Bagler launched another invasion from Denmark, establishing control in eastern Norway.
Fighting continued until church leaders brokered the Settlement of Kvitsøy in 1208. Under this compromise, the Bagler leader Philippus Simonsson retained eastern Norway but renounced the royal title. Peace held until 1217.
Final Unification under Håkon Håkonsson
When King Inge Bårdsson died in 1217, the Birkebeiner elected the young Håkon Håkonsson as king. His rival Skule Bårdsson became commander of the army and wielded immense influence.
After the Bagler leader’s death later that year, Skule persuaded the Bagler faction to dissolve and swear loyalty to Håkon, formally reuniting the kingdom. Residual revolts continued until 1227.
Skule later challenged Håkon directly. Despite receiving the title of duke and marrying his daughter into the royal family, Skule declared himself king in 1239. His rebellion failed, and he was killed in 1240. This marked the definitive end of the civil war era.
Contemporary and Modern Interpretations
Medieval chroniclers viewed the civil wars as a moral catastrophe characterized by betrayal, sacrilege, and bloodshed. Writers such as Theodoricus the Monk and William of Newburgh emphasized the unprecedented violence and instability.
Modern historians have offered multiple explanations. Earlier interpretations emphasized aristocratic resistance to royal authority or church involvement. Later materialist theories argued for class conflict driven by land inequality, but these views have largely fallen out of favor due to lack of evidence.
Recent scholarship highlights structural causes: weak succession laws, regional rivalries, foreign interference, and gradual centralization of royal power. By the end of the conflict, Norway had developed a stronger monarchy, clearer succession principles, and a centralized administration capable of preventing renewed fragmentation.
In this perspective, the civil wars represent not merely chaos but the final stage in Norway’s long process of political consolidation.
Sources and Historical Evidence
Knowledge of the civil war period comes primarily from medieval sagas, including Heimskringla, Fagrskinna, and Morkinskinna, written in the early 13th century. Later periods are documented in Sverris saga, the Bagler sagas, and Håkon Håkonsson’s saga, which were composed close to the events they describe.
Additional evidence comes from royal charters, runic inscriptions, and archaeological finds. While the sagas reflect political bias and narrative shaping, they remain indispensable for reconstructing Norway’s medieval conflicts.



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