Key Facts
- Year
- 1368
- Conflict
- Danish–Hanseatic War (1361–1370)
- Attacker
- County of Holstein
- Target
- Koldinghus castle, Denmark
- Result
- Inconclusive; probable eventual surrender
Strategic Narrative Overview
In 1368, forces from the County of Holstein laid siege to the Danish royal castle of Koldinghus. The castle's commander, Peder Iversøn, held out against the besieging force. Unable to take the castle outright, Holstein could not compel an immediate surrender. Iversøn negotiated an unusual conditional arrangement, promising to hand over the fortress only if King Valdemar IV died, abdicated, or forfeited his kingdom, effectively tying the castle's fate to the king's own.
01 / The Origins
The siege of Koldinghus took place within the broader context of the Danish–Hanseatic War (1361–1370), a conflict stemming from King Valdemar IV of Denmark's aggressive Baltic policies and his capture of the Hanseatic trading hub of Visby in 1361. The Hanseatic League, allied with Holstein and other powers, sought to curb Danish dominance over Baltic trade routes and retaliate against Valdemar's expansionism.
03 / The Outcome
The siege ended inconclusively for both sides. Iversøn is absent from later peace negotiations, suggesting he ultimately surrendered Koldinghus under circumstances that remain unclear. The broader Danish–Hanseatic War concluded with the Treaty of Stralsund in 1370, which heavily favoured the Hanseatic League and curtailed Danish power in the Baltic region.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Side B
1 belligerent
Peder Iversøn.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.