The Church of Saint Mary of Pulcherada, most commonly known as Pulcherada Abbey, began to be built between the 6th and 8th century AD on what used to be a Roman encampment. The first section to be built was the apse, and the main building was completed between 1029 and 1031. The bell tower was built within the next 200 years, and was built to be disproportionally taller than the rest of the building, which suggests it might have had defense purposes. The abbey became a center around which a village would start to form and eventually grow to become what is now the comune of San Mauro Torinese.
Before the 17th century, the abbey took up the terrain of what are currently the city hall and the church. The abbey contained gardens, fields for cultivation, a mill, a bakery, and a variety of artisanal workshops. In 1665, because of decay, abbot Petrino Aghemio chose to demolish a large portion of the complex, greatly reducing the size of the abbey. In 1803, the few monks present moved to the nearby abbey of San Quintino di Spigno, and thus Pulcherada Abbey was officially closed down the same year by order of Pope Pius VII. Since then, the former abbey has been used exclusively as a church.
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.