Events from the year 1678 in Denmark.
Incumbents Monarch – Christian V Grand Chancellor – Frederik Ahlefeldt
Events
Scanian War 18 January – Battle of Warksow, the Swedish navy defeats the forces of Denmark-Norway and Brandenburg-Prussia. 22–24 September – Invasion of Rügen, the allied forces of Denmark-Norway and Brandenburg-Prussia occupy Rügen.
Births 24 June – Ulrik Christian Gyldenløve, Count of Samsø, admiral and illegitimate son of Christian V (died 1719) 30 November Gregorius Klauman, businessman and judge (died 1752)
Deaths 5 October – Hedevig Ulfeldt, daughter of king Christian IV (born 1626)
References