The construction of St. Sauveur Basilica was commissioned around 1120 by Sir Rivallon le Roux, Lord of Dinan, on his return from the first Crusade. The church was extensively rebuilt and extended during the 15th and 16th centuries and is a successful blend of architectural styles. The lower part of facade is part of the original 12th century building. The bell tower was built during the 18th century to replace the 17th century dome which had been destroyed by lightning.
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.