Riedheim Castle was built in the 13th and 14th centuries and was owned by the von Randegg family. The castle was allegedly damaged in the Swiss War and around 1500 the residential tower was probably raised and the courtyard portal expanded. In 1518 the castle was owned by Hans von Schellenberg and in 1609 by Konrad Vintler von Plätsch. In 1601 the property went to Archduke Leopold of Austria and in 1735 it was sold to the Petershausen Monastery. In 1803 the castle came to the Margraves of Baden and was sold to the municipality of Riedheim in 1841.
After the tower roof collapsed on May 20, 1951 and the top gable broke off, the top floor was restored in 1957. 1976 to 1978 the castle was restored.
The rectangular castle complex comprises a bering of around 38 by 27 meters with a rectangular residential tower in the middle with late Gothic stepped gables. The four-storey residential tower on an area of approximately 12.35 by 8.7 meters is 27 meters high with the high entrance 4.5 meters high. The wall thickness of the tower shows a thickness of 1.5 meters on the ground floor and a thickness of one meter from a height of three meters.
The curtain wall is around 1.2 meters thick and has scales built on the inside. The arched entrance (around 1550) is on the west side. The castle was surrounded by a moat and probably a rampart. The castle can only be viewed from the outside.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.