Franco-German War of 978-80

Most Polabian Slavs see Jesus as a "German god" and remain pagan, despite the efforts of Christian missionaries.

In the Great Slav Rising in 983, the pagan Slavs revolt against their subjugation to the Kingdom of the Eastern Franks, aka East Francia.

The Slavic Lutici and Obotrite people, who live to the east of the Elbe in modern northeast Germany, defeat Emperor Otto II in at the Battle of Stilo in 982, then rebel against the Germans the following year.

The Hevelli and Lutici destroy the Bishoprics of Havelberg and Brandenburg., and some Slavs advance across the Elbe into Saxon territory, but retreat when the Christian Duke of the Polans, Mieszko I, attacks them from the East.

The Holy Roman Empire retains only nominal control over the Slavic territories between the Elbe and the Oder.

Lothair, king of France, has attempted to increase his influence in Lorraine, once held by his family, and in turn his lege lord, Emperor Otto II, has encouraged resistance to Lothair's overtures.

Lothair in 978 mounts an expedition into Lorraine accompanied by Hugh Capet; upon their crossing the Meuse river, Otto flees.

Lothair then sacks the imperial Palace of Aachen, reversing the direction of the bronze eagle of Charlemagne to now face east instead of west.

Otto will respond with an invasion of France in the autumn.

Otto II’s Retaliation Against Lothair: The Invasion of France (978)

In response to King Lothair of France’s invasion of Lotharingia in early 978, Emperor Otto II launched a counteroffensive in the autumn of that year, striking deep into West Francia. The campaign underscored the ongoing Franco-German rivalry over the contested region of Lotharingia, which had long been a point of conflict between the Carolingians and the Ottonians.

The Imperial Advance on Paris

Otto II’s army crossed into West Francia, advancing rapidly through Reims and stopping at the Abbey of St. Medard in Soissons for devotions before pushing toward Paris. His forces inflicted three days of destruction, signaling his intent to retaliate against Lothair’s earlier incursion. However, his offensive failed to deliver a decisive blow, as Paris remained beyond his grasp.

Hugh Capet’s Defense and Otto’s Retreat

Lothair’s ally, Hugh Capet, played a crucial role in defending the kingdom. Otto, unable to sustain his advance, was eventually forced to retreat. As he withdrew, his forces suffered a costly defeat when Lothair’s army ambushed his rear guard while crossing the Aisne River. This setback marked the end of his campaign, forcing him to abandon any hopes of permanently asserting imperial dominance over West Francia.

Aftermath and Significance

Though Otto II’s raid demonstrated the military strength of the Holy Roman Empire, it ultimately failed to redefine the balance of power in Lotharingia. The campaign further strained Franco-German relations and reinforced the emerging prominence of Hugh Capet, who would soon overthrow the Carolingian line and establish the Capetian dynasty in 987.

This confrontation was one of the final major Carolingian-Ottonian clashes over Lotharingia, highlighting the waning power of the Carolingians and the growing independence of the Capetians, who would shape the future of France.

The Peace of Margut-sur-Chiers (980): Lothair’s Renunciation of Lotharingia

In July 980, King Lothair of West Francia and Emperor Otto II reached a settlement at Margut-sur-Chiers, ending years of territorial dispute over Lotharingia. This agreement, concluded before any major military engagement, marked a significant concession by Lothair, as he renounced all claims to Lotharingia, ceding de facto recognition of Ottonian rule over the contested region.

Background of the Conflict

Lotharingia, the former kingdom of Lothair II, had been a source of Franco-German rivalry since the Treaty of Verdun (843) divided the Carolingian Empire. Though the region had come under Ottonian control, Lothair of West Francia attempted to reclaim it in 978, launching an invasion of the Lower Rhine and briefly occupying Aachen.

Otto II retaliated later that year with an incursion into West Francia, advancing as far as Paris before being forced to withdraw. However, neither side had achieved a decisive victory, making a negotiated settlement desirable.

Terms and Consequences of the Peace

At Margut-sur-Chiers, Lothair:

• Formally abandoned his claims to Lotharingia, recognizing its permanent status as an imperial territory under the Holy Roman Empire.
• Secured a peace agreement with Otto II, preventing further military campaigns between the two realms.

The treaty stabilized the Franco-German border for the time being, though it further weakened Lothair’s position within West Francia. His inability to reclaim Lotharingia or challenge imperial power diminished the prestige of the Carolingian dynasty, strengthening the rise of Hugh Capet, who would overthrow the Carolingians in 987, founding the Capetian dynasty.

Meanwhile, Otto II, freed from conflict in the west, was able to focus on consolidating his rule in Italy, where he sought to strengthen imperial authority against Byzantine and Muslim forces.

Otto II, following his brief war with Francia over Lower Lorraine, leads an expedition into Italy in 980 to restore Pope Benedict VII, who had been driven from his see by a Roman faction.