Bråborg was a former Royal castle at Bråviken. The house was built by Queen Dowager Gunilla Bielke in 1588-1590 and she lived there after her husband, King John III of Sweden, died in 1592. Gunilla Bielke herself died at Bråborg in 1597. Bråborg was later owned by her son, duke John of Östergötland. In 1612 he married his cousin, princess Maria Elisabeth of Sweden. They both died at Bråborg in 1618.
The building was partly destroyed in a fire in 1669, and in 1719 it was burnt down by a Russian army. The army also attacked the nearby town of Norrköping. The inhabitants needed stone to rebuild their town and used building material from the ruins of Bråborg. The new manor house at Bråborg was built about 1,000 metres from the burnt down house.
Today, a ruin is all that remains of the estate. The foundations and cellars are still visible today, together with the moats and parts of the gardens.
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.