Sverris saga mentions that 600 men and 40 noble women lived in the fortress ca.

The site was reinforced by King Håkon Håkonsson after the great fire of 1248.

Directly underneath Sverresborg lies the residence of the master of the ramparts (Vollmesterboligen), the oldest of which go back to the 18th century.

During World War II the German occupants established two anti aircraft batteries in the fortress.

[4] The fortress has not fulfilled an operative capacity since World War II, but is still used by the military of Norway for office and training facilities.