The Castello Svevo or Swabian Castle (Castello normanno-svevo), also known as the Houhenstaufen Castle, is a castle in the Apulian city of Bari.
Probably built in 1132 by Norman King Roger II, it was destroyed in 1156 by king William I of Sicily and rebuilt and reinforced in 1233 by the Holy Roman emperor Fredrick II. During the Angevin domination, it went through several transformation, and after being acquired by Duke Ferdinand of Aragon, was donated to the Sforza family and passed to Bona Sforza, Queen of Poland. After Bona's death, it was returned under the King of Naples and transformed into a prison and barracks.
The castle is surrounded by a moat on all sides, except the northern section, which was bordering the sea and can be accessed from the bridge and the gate on the southern side. It is mainly composed of the Aragon walls and the main Hohenstaufen tower, and is currently used for exhibitions.
According to the tradition, in 1221 Emperor Frederick II met St. Francis of Assisi in this castle. According to tradition, the emperor had a courtesan sent to Francis's room and watched through a peephole to see what would happen. When Francis sent the woman away, Frederick was impressed with his principles; the two spent the rest of the night in conversation. This story is not confirmed beyond doubt, but it is considered believable.
The castle it is currently used for exhibitions.
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.