Santi Pietro e Paolo d’Agrò church one of the foremost examples on Sicily of Norman architecture. The church was constructed during the 12th century as part of a Basilian monastery. Its exterior is characterised by its block-like form, but the facade is richly decorated. Inside, the church has the plan of a basilica with three aisles. Two domes rise from the central nave, one above its centre and one above the choir.
The architecture of the church displays influences from a vast variety of sources, and constitutes heritage of Muslims, Byzantines, and Normans. The block-like form of the exterior is reminiscent of North African contemporary architecture while the floor plan of the church is similar to the way churches were built in the Byzantine architectural tradition. Its principle of construction at the same time is essentially that of Western European Gothic architecture. In its details and decorations, too, the church exhibits a wealth of influences (e.g. in the use of muqarnas vaulting).
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.