Lisieux Cathedral (Cathédrale Saint-Pierre de Lisieux) is a former Roman Catholic cathedral, and a national monument of France. Built between 1170 and the middle of the 13th century through the initiative of Bishop Arnulf, the cathedral was the seat of the Bishop of Lisieux until the diocese of Lisieux was abolished under the Concordat of 1801 and merged into the Diocese of Bayeux.
The west front of the building consists of three portals surmounted by two towers. The south tower was built in the 16th century and at the top bears a 17th-century flèche. Buttresses were added to the south face in the 15th century. The cathedral survived World War II wholly intact.
An earlier cathedral is presumed to have existed since the 6th century, as there was a Bishop of Lisieux from that time, but nothing is known of the earlier edifice.
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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.