The Royal Palace in Oslo was built in the first half of the 19th century as the Norwegian residence of the French-born King Charles III John of Norway, who reigned as king of Norway and Sweden. The palace is the official residence of the current Norwegian monarch while the Crown Prince resides at Skaugum in Asker west of Oslo. The palace is located at the end of Karl Johans gate in central Oslo and is surrounded by the Palace Park with the Palace Square in the front.

More details: https://en.wikipedia.org/wiki/Royal_Palace,_Oslo