San Giovanni dei Lebbrosi is an ancient church in Palermo. While built by the Norman rulers, the architecture has strong Arabic influences. The builders may have been Fatimid architects. The church in 1119 was attached to a leprosarium, hence the title. The church was dedicated to St John the Baptist. The adjacent hospital no longer exists.
The church was initially commissioned in 1071 by Robert Guiscard and Roger I of Sicily. Tradition holds the besieging Norman Army had camped near this site, near an Arabic castle, and here erected a temporary shrine, which later became the site of the church. The leprosarium was putatively built because Roger II's brother died of Leprosy. Over the years, the hospital and church was under the control of various religious orders, including the Teutonic knights.
The church, which had become a house, underwent dramatic restoration from 1920 to 1934. Centuries of accretions were removed. Some of the internal columns have capitals decorated with Kufic script.
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.