The Stromburg was probably built in the 11th century and received its first documented mention in 1056 when Count Bertolf named himself after the Stromburg. In 1116, it was destroyed and subsequently rebuilt by Archbishop Adalbert I of Mainz. These early mentions likely refer to the 'old Stromburg' on the Pfarrköpfchen hill.
The first reliable mention of the Stromburg dates back to 1287. Under its protection, the village of Stromberg developed in the Guldenbach Valley, first mentioned in 1344.
During the Thirty Years' War, the castle was captured multiple times and was finally destroyed on March 3, 1689, during the War of the Palatine Succession. From the castle complex, the shield wall, the keep, a mighty gate tower, as well as parts of the outer wall and the outer ward, are still preserved. The Stromburg was the home of Hans Michael Elias von Obentraut, a cavalry leader of the Thirty Years' War.
From 1977 to 1981, parts of the castle ruins were restored and, with the addition of modern elements that now define its appearance, adapted for gastronomic use. Following another renovation that cost around eight million German Marks, since 1994, the building housed a gourmet restaurant led by Johann Lafer. It was initially named Le Val d’Or and was later renamed Johanns Küche in 2019. Since July 2022, the restaurant Das Kilger is managed there by Anthony Sarpong. In addition to the restaurant, the building houses a rustic tower room used as a secondary restaurant and the Stromburg Hotel.
The Royal Palace was built in the first half of the 19th century as the Norwegian residence of King Charles III, who also reigned as king of Sweden and otherwise resided there, and is the official residence of the present Norwegian monarch. The crown prince resides at Skaugum in Asker west of Oslo. The palace has 173 rooms.
Until the completion of the Royal Palace, Norwegian royalty resided in Paleet, the magnificent town house in Christiania that the wealthy merchant Bernt Anker bequeathed to the State in 1805 to be used as a royal residence. During the last years of the union with Denmark it was used by the viceroys of Norway, and in 1814 by the first king of independent Norway, Christian Frederick.