St. Michael's Church in Fulda is considered to be the oldest Holy Sepulchre church in Germany, built in the Carolingian architectural style (Pre-Romanesque) by the abbot Eigil in the years 820-822. It served as a burial chapel to Fulda monastery founded in 744, which was one of the prominent cultural centres of the early Middle Ages. St. Michael stands in the neighbourhood of Fulda cathedral, and the architect was probably the monk Racholf (d. 824).
The rotunda and crypt remain preserved from this time. In the 10th and 11th century, the church was extended from the rotunda, and a west tower was built. In 1618 the roof over the rotunda was rebuilt with a conical roof, and in 1715-1716 a chapel was added to the north side. Wall paintings in the interior date from the 11th century.
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.