Fritzøehus is the largest privately owned estate in Norway. The estate has traditionally been associated with various members of the Treschow family. Fritzøehus was built for Michael Treschow (1814-1901) during the years 1863–1865. Michael Treschow was one of the country's most important industrialists in the mid-19th century. He owned Fritzøe Jernverk, an ironworks together with sawmills and sizable forest properties in Larvik.
Fritzøehus was designed in Renaissance Revival architecture by architect Jacob Wilhelm Nordan (1824–1892). The manor house was expanded in 1885–1889 and 1897–1898. The total floor area includes 75 rooms plus 21 basement rooms, making it the largest private residence in Norway.
Fritzøehus is located in Fritzøehus park, which today is a designated conservation area for the purpose of preserving the large beech forests and the distinctive landscape. In the 6.9 km2 park there are also walnut, fir, and spruce trees. The park was built in the English style in the 1860s. In the courtyard stands a water fountain and a sculpture of a bear by sculptor Anne Grimdalen (1899–1961). The park includes a collection of fallow deer and mouflon from the Mediterranean.
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.