Kronburg Castle was first time mentioned in 1227. In the 13th and 14th centuries it changed hands several times between Hohenstaufen and Habsburg vassals. The castle was restored in 1490-1536 by Rechberg family. In 1524 it was occupied by revolting peasants and in 1625-1627 it was passed to Johann Eustach von Westernach.
Kronburg was conquered and partially demolished by French army during the War of the Spanish Succession (1703) and rebuilt in residential style in 1707. Today the castle is owned by the von Vequel-Westernach family and hosts weddings and other events.
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.