The Church of Saint-Pierre (Église Saint-Pierre) was built in the early 13th and the construction continued until the 16th century. The spire was destroyed in 1944, and has since been rebuilt. The eastern apse of the church was built by Hector Sohier between 1518 and 1545. The interior choir and the exterior apse display an architecture that embodies the transition from Gothic to Renaissance.
Until around the mid 19th century, the eastern end of the church faced onto a canal that was then covered and replaced by a road. Various artists and engravers recorded this relation of the church to the canal; for instance, the Scottish painter David Roberts made several very similar views, one of which (dated to c.1830) is in Musée des Beaux-Arts in the Château de Caen.
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.