1680s|Monarch – Frederick III
Steward of the Realm: Joachim Gersdorff (until October, office disbanded)
The Treaty of Copenhagen is signed, marking the conclusion of the Second Northern War.
May 31 – The Swedish troops depart from their camps outside Copenhagen.
July 11 – The city gates of Copenhagen re-opens and trade returns to normal.
September 10 – The estates gather at Copenhagen Castle to solve the financial problems faced after the wars and Frederick plays the different estates against each other.
October 10 – The 1660 Danish state of emergency is declared by the king with the purpose of putting pressure on the nobility, a move which proves successful.
October 13 – Bishop Hans Svane publicly offers the Heraldry Kingdom to the annulment of the Haandfæstning, and the institution of absolute monarchy is instituted by decree.
October 14 – A Constituent Commission set up by the king meets for the first time to embark on the task of drawing up a new constitution but unable to agree it simply decides to cancel the existing Håndfæstning and leave it to the king to write the new constitution.
October 17 – Extensive celebrations pay homage to the new Heraldry King.
November 4 The Chancellery and the "Geheime-statsrådet" are established.
December 19 - Ove Gjedde, admiral (born 1594)
1660 in Denmark Wikipedia
Events from the year 1660 in Denmark.