Björksund Castle is a castle-like manor house in Sweden. Björksund located on Sibbofjärden, northeast of Nyköping in Södermanland County. The estate first belonged to the Grip family, but came in the late Middle Ages through marriage to the Privy Councilor Göran Eriksson Gyllenstierna (1498-1575) of Fågelvik. The estate remained in his family until 1776, when it partly passed by purchase to Count Carl Gabriel Mörner (1737-1828), heir to the Privy Council member and Marshal of the Realm Göran Gyllenstierna (1724–1799).
The manor house was built in Baroque style during 1727. It was designed by French-Swedish architect Joseph Gabriel Destain (died in 1740). Additions in the 1740s were by Baron Carl Hårleman (1700–1753).
The estate covers 4,700 hectares (12,000 acres) and large areas of the archipelago. Björksund Förvaltnings AB also manages a number of properties in Nyköping.
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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.