The Tavna Monastery is a Serbian Orthodox monastery located south of the city of Bijeljina in north-eastern Republika Srpska, Bosnia and Herzegovina. The date of its foundation is unknown.
The chronicles of monasteries Tronoša and Peć say it was built by King Stefan Dragutin's sons Vladislav and Urošica. The present monastery church is built in the same place as the original one.
Tavna was damaged in the first years of Ottoman rule, but was restored by the people. This was not the only time the monastery was damaged. It was damaged many times during the Ottoman period and also during World War II. Between 1941-45 Tavna was bombed by the Nazi-affiliated Croat Ustashe but was reconstructed after the war.
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.