Question: When was the Northern Seven Years War?
About the article "Denmark", section "Early modern history (1536–1849)".

Candidate passages:
He is first mentioned in the records during the Northern Seven Years' War (1563-70), when he served at King Frederik II’s court, as well as in field operations.
He was a member of the king's retinue at the peace treaty negotiations at Roskilde and served as the government's messenger to peace mediators in Szczecin.
His records were a significant contribution to the recorded Danish history of this war.
The Treaty of Stettin was concluded on 13 December 1570, ending the Northern Seven Years' War between the Swedish Empire and Denmark (in alliance with Lübeck and Poland).
The treaty was favorable for Denmark, assuring Danish hegemony in Northern Europe for a short period.  
  Seven Years' War (1756–1763)  Northern Seven Years' War (1563 and 1570)  
The Northern Seven Years' War (also known as the "Nordic Seven Years' War", the "First Northern War" or the "Seven Years War in Scandinavia") was the war between the Kingdom of Sweden and a coalition of Denmark–Norway, Lübeck and the Polish–Lithuanian union, fought between 1563 and 1570.
The war was motivated by the dissatisfaction of King Frederick II of Denmark with the dissolution of the Kalmar Union, and the will of King Eric XIV of Sweden to break Denmark's dominating position.
The fighting continued until both armies had been exhausted, and many men died.
The resulting Treaty of Stettin was a stalemate, with neither party gaining any new territory. 
  The novel "The Luck of Barry Lyndon" (1844) by William Makepeace Thackeray is set against the Seven Years' War.
This is a quote about the war from the novel:  Stanley Kubrick's film "Barry Lyndon" (1975) is based on the Thackeray novel.
The events in the early chapters of Voltaire's "Candide" are based on the Seven Years' War; according to Jean Starobinski, ("Voltaire's Double-Barreled Musket", in "Blessings In Disguise", (California, 1993) p. 85), all the atrocities described in Chapter 3 are true to life.
When "Candide" was written, Voltaire had been opposed to militarism; the book's themes of disillusionment and suffering underscore this position  The board games "Friedrich" and, more recently, "Prussia's Defiant Stand" and "Clash of Monarchs" are based on the events of the Seven Years' War  The Grand strategy wargame "Rise of Prussia" covers the European campaigns of the Seven Years' War  The novel "The Last of the Mohicans" (1826) by James Fenimore Cooper and its subsequent adaptations are set in the Northern American Theatre of the Seven Years' War  "The Partisan in War" (1789), a treatise on light infantry tactics written by Colonel Andreas Emmerich, is based on his experiences in the Seven Years' War.
The Seven Years' War is the central theme of G. E. Lessing's 1767 play "Minna von Barnhelm or the Soldiers' Happiness".
Numerous towns and other places now in United States were named after Frederick the Great to commemorate the victorious conclusion of the war, including Frederick, Maryland, and King of Prussia, Pennsylvania.
The fourth scenario of the second act in the RTS "Age of Empires III" is about this military conflict, with the player fighting along with the French and against the British.  
Mogens Svale (c.1530–1581) was a Danish-born military commander and landowner in Norway.
Svale is noted for his merits during the Northern Seven Years' War, which has been called "Svalekrigen", named after him.