4 Mark Dansk - Frederik III Type I

Frederik III issued this coin during one of the most consequential periods in Danish history: the siege of Copenhagen by Swedish forces in 1658–1660, following the catastrophic Treaty of Roskilde. The city held, and the subsequent Peace of Copenhagen in 1660 clawed back territories Frederik had been forced to cede — a rare reversal of fortune. That same year, the crisis served as political cover for abolishing the power of the nobility and establishing hereditary absolute monarchy, fundamentally restructuring the Danish state.

The brief two-year window of this type's production corresponds almost exactly to the siege itself.