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From about 1233 the Bamberg bishops had the Romanesque Griffen parish church enlarged and rebuilt as a Premonstratensian monastery. The first canons descended from Vessra Abbey in the Franconian County of Henneberg. The monastery complex was completed in 1272 and significantly enlarged by Baroque buildings in the 17th century. Griffen remained the only Premonstratensian abbey in the Inner Austrian lands until its abolition under the rule of Emperor Joseph II in 1786.
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.