Santa María Jus del Castillo Church was built in the 12th century on the site of a synagogue, since this was then the Jewish quarter of the city. Its original name was Iglesia de Santa María y de Todos los Santos. It was used as a church until the 17th century. Today it is used as an Interpretation Center of the Romanesque and the Camino de Santiago. It was declared a Site of Cultural Interest.
It is a church with a single nave. The apse and the central body of the church are Romanesque, but the façade and tower are from the Baroque period.
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.