Dronningholm Castle was a Danish medieval castle built by the fjord in North Zealand, which would later become Arresø.
King Valdemar the Great began building the castle, which was completed under Valdemar around 1200th According to legend, got Queen Dagmar the palace as a gift at their wedding.
The castle was built in traditional style of brick and with a moat and drawbridge. Water levels in Arresø was at the time higher than today, when the lake drained by Frederiksværk channel. Thus stood originally water in the ponds, which are now drained. The original ruins are now completely disappeared. In the 1930s it was found on the field that covered the castle ramparts, some bricks, which, with help from the National Museum were used for a partial selection of the castle probably have lain. Drawbridge had been in the east wing, where also a gate tower would have risen. I port the street was when the castle was later lost its strategic importance, established an oven in boulders. This is also seen marked.
The castle wings would have consisted of a north-facing and a west facing lot with vaulted ceilings. In the middle of the wing is located some finely hewn granite blocks that served as the basis of supporting pillars in the middle of wing buildings. In the castle mounds western side can be seen marking of an octagonal tower.
The castle is believed to have been used as a defense only once - during a peasant revolt. It was ravaged by fire in 1525 and was from 1557 stripped of building materials, much of which went to the construction of Frederiksborg Castle