It is not known exactly when the Tiefburg castle was built or by whom. It is assumed that it was built in the 12th century, possibly by the Abbey of Lorsch or the Count Palatinates of the Rhine (later known as the Prince Electors of the Palatinate), who set up residence in nearby Heidelberg around this time. It is also possible that the castle had its origins in a fortiied estate. The knights of Handschuhsheim who lived in the Tiefburg were initially unfree knights, known as ministeriales, in the service of the Abbey of Lorsch, and later on vassals of the Prince Electors of the Palatinate. The dynasty died out when the last knight of Handschuhsheim, Johannes (Hans) V., died aged 16 on 31st December 1600 from injuries sustained in a duel. Through inheritance, the Tiefburg became the property of the barons of Helmstatt (who became counts of Helmstatt in the 18th century).
Tiefburg was badly damaged in the Thirty Years‘ War. In 1689 it fell victim to the War of the Palatine Succession and became uninhabitable, whereupon the Helmstatts built a new residence in the immediate vicinity. The original gate of this new residence can still be seen to the east of the square in front of the Tiefburg. Count Raban von Helmstatt had the Tiefburg restored in the years 1910 to 1913.
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.