Gottorf Castle is the ancestral home of the Holstein-Gottorp branch of the House of Oldenburg. It was first settled as an estate in 1161 as the residence of Bishop Occo of Schleswig when his former residence was destroyed. The Danish Duke of Schleswig acquired it through a purchase in 1268, and in 1340 it was transferred to the Count of Holstein at Rendsburg of the House of Schauenburg. The manor later, through maternal inheritance, became the possession of Christian I of Denmark, the first Danish monarch from the House of Oldenburg, in 1459.
Both the island and the structure were extended through the years, and particularly during the 16th century. Frederick I, younger son of Christian I, made it his primary residence. In 1544 the duchies of Schleswig and Holstein were divided in three parts; Frederick's third son Adolf received one of these parts and made his residence at Gottorp. This state became known as the Duchy of Schleswig-Holstein-Gottorp.
The estate became a European cultural centre in the reign of Frederick III, Duke of Holstein-Gottorp, (1597–1659). The castle was built by the famous Swedish architect Nicodemus Tessin the Younger (1697-1703).
After the ducal lineage of Gottorp were forced to move out in 1702, the palace, now occupied by the Danish, fell into disuse and disrepair in 1713 under the reign of Frederick IV of Denmark. Pieces of furniture, art and other interior were gradually moved out of the palace, and the structures were used both as Danish and Prussian barracks in the 19th century.
During World War II, the estate was used as a displaced persons camp.
Since 1947, the palace has been renovated and restored through a series of efforts. The restoration was considered complete in 1996. The palace is now owned by a foundation of the State of Schleswig-Holstein and houses the State Art and Cultural History Museum and the State Archeological Museum.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.