Church of Santa Maria de Arbas is a good example of late León romanesque, built during the 12th and 13th centuries. It once belonged to the regular order of Saint Agustin. The church has three naves and four pillars supporting the round arches that separate the naves.
It was officially founded in the 12th century by the Count Fruela, El Cid's brother in law.It was ruled as a Colegiata (Collegiate Church) and a Hospedería (Hostelry) by the Augustine monks.As a result of its decline, it became a simple parish church. It was restored after the Civil War. The building consists of fine grey limestone blocks. The gothic chapel was added later, in the 12th century. The sacristy, the tower, the portico and the vaulting of the main nave date from the 17th 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.