The Patriarchal Cathedral of the Holy Ascension is a former Eastern Orthodox cathedral in the city of Veliko Tarnovo, in north central Bulgaria. Located on top of the fortified Tsarevets hill in the former capital of the Second Bulgarian Empire, the cathedral was the seat of the Bulgarian patriarch from its construction in the 11th–12th century to its destruction in 1393.
The current building of the Patriarchal Cathedral is considered by scholars to have been built in two stages. The first stage of construction was carried out in the late 11th century or the 12th century. The cathedral was initially built as a monastery church in the middle of a monastery compound, though in the early 12th century it was already the seat of the Bulgarian patriarch. The compound suffered large-scale damage caused by a fire, which necessitated the church's reconstruction in middle of the 14th century. Besides repair and reinforcement efforts, work on the church in the 14th century also included the construction of the exonarthex and the bell tower.
The Patriarchal Cathedral was destroyed after the Ottomans captured the Bulgarian capital after their Siege of Tarnovo on 17 July 1393. Reconstructed in the 1970s and 1980s, it follows a cross-domed plan with a bell tower and a triple apse. Richly decorated on both the exterior and interior, its internal walls now feature modern frescoes, the presence of which has meant that it has not been reconsecrated. Though not active as a Christian place of worship, it has been open for visitors since 1985.
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.