The Apollinariskirche is a church on the site of a Roman temple on the Apollinarisberg, a hill above the German town of Remagen. That hill was known as the Martinsberg in the 5th and 6th centuries, presumably after a Frankish chapel there dedicated to Saint Martin, patron of the Franks. In the 9th century this chapel was replaced by a Romanesque church.
In 1110 the Benedictines of the Michaelsberg Abbey, on the initiative of the people of Remagen, set up a provost there. The relics of Saint Apollinaris of Ravenna probably arrived on the mountain at the end of the 14th century, since a pilgrimage to the Apollinarisberg is recorded in 1384. The sarcophagus is the main relic in the 14th century crypt of the church.
A new Neo-Gothic church was built on the site from 1837 to 1852.
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.