The Ozren Monastery is a Serbian Orthodox monastery dedicated to Saint Nicholas and located 6 kilometres from the town of Petrovo in northern Republika Srpska, Bosnia and Herzegovina. It is the spiritual centre of the area of Mount Ozren. It was probably founded in the second half of the 16th century, during the office of Serbian Patriarch Makarije Sokolović, who was granted permission from the sultan of the Ottoman Empire to renovate and build churches and monasteries. Folk tradition, formed in the 18th century, has it that the Ozren Monastery was founded by King Dragutin, a member of the Serbian Nemanjić dynasty, who ruled north-eastern Bosnia from 1284 to 1316.
The frescoes in the monastery's church were painted in the early 17th century. After the Great Turkish War (1683–1699), the monastery fell into disrepair. The renovation of the church began in 1842, after it was allowed by Ottoman authorities. The bell tower outside the church was built in 1872. The church was also refurbished in 1920 and 1996. Among its icons is a Pietà painted in the 17th century by Emmanuel Lambardos, a painter of the Cretan School.
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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.