Sausenburg Castle was originally the stronghold of the lords of Sausenburg, and is built on a 665 metres high hill. At the beginning of the 12th century, the area was given to the Benedictine monks of the Monastery of St Blaise. The counts of Hachberg acquired the property in 1232 from the monastery. They built the castle in order to protect the area and lived there from 1246. In 1306, the counts founded the Sausenberg dynasty. From that point on, they called themselves the margraves of Hachberg-Sausenberg.
In 1315, Liuthold II of Roetteln, the last male member of his dynasty, bestowed Roetteln to the counts of Hachberg-Sausenberg. He died in 1316. The counts of Hachberg-Sausenberg moved to Rötteln Castle and established their advocates (vogts) on the Sausenberg.
John, the last of the counts of Freiburg, bestowed his property Badenweiler to the margraves of Hachberg-Sausenberg in 1444; the merger of Badenweiler, Rötteln, and Sausenberg marked the beginning of the Markgräflerland.
In 1503, through inheritance, the Sausenburg and the Markgräflerland became part of the Margraviate of Baden. The castle was destroyed in 1678 during the Franco-Dutch War by the army of French Marshal Créquy. At this point, medieval fortifications could not survive long against the advances in artillery and siege warfare.
Today an old circular rampart, a tower and several wall segments remain of the former castle.
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.