Together with Tårnborg near Korsør, and the castle on Sprogø, Nyborg Slot constituted the fortification of the Great Belt region.
Nyborg Slot soon became of great political significance. Many important meetings were held here,
among others Danehof. Today only the west wing and part of the large tower towards the east remain. Nyborg Slot is one of the oldest secular buildings which is preserved in Denmark.