The Holy and Great Monastery of Vatopedi on Mount Athos was built during the second half of the 10th century by three monks, Athanasius, Nicholas, and Antonius, from Adrianople, who were disciples of Athanasius the Athonite.
From then onwards, several buildings have been constructed, most of them were built during the Byzantine period and during the 18th and 19th centuries when the monastery reached its highest peak.
Vatopedi features numerous wings, towers, etc. The katholikon (main church) was built in the tenth century, and is dedicated to the Annunciation of the Blessed Virgin Mary, in accordance with the Athonite architecture. Samples of Byzantine mosaics remain, some of which were retouched in the 12th century and in 1312. Nineteen smaller chapels in addition to the katholikon lie within and outside the boundaries of the monastery. Five are in the katholikon. These of the Saint Nicholas and Saint Demetrios lie left and right of the eso-narthex, and the chapel of the Virgin of Consolation. In the monastery are the chapels of the Holy Girdle and of the Saints Kosmas and Damian.
More than 120 monks live in the monastery today, where extensive construction projects are underway to restore the larger buildings.
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.