Sázava Monastery is a former Benedictine abbey and a monastery in Bohemia, established by Bretislaus I, Duke of Bohemia around 1032. It is situated some 30 km southeast of Prague, on the right bank of the eponymous Sázava river, a right tributary of the Vltava.
The monastery is notable as having followed Slavonic liturgy in the 11th century. It was re-established under the Latin rite in 1097, until its destruction in 1421 due to the Hussite Wars. It was again re-established as part of the re-catholization of Bohemia under Habsburg rule in 1664, and finally dissolved in 1785.
The extant buildings mostly date to the Baroque period, with 19th-century neo-Renaissance extensions, with some remaining structures in the Gothic style of the 13th to 14th centuries, notably the unfinished three-nave Gothic basilica.
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.