The church of Saints Julián and Basilisa was originally built in the late twelfth century. Two inscriptions are provided, one, on the west window of the portico, dates the work to 1186 and names the sculptor Juan de Piasca, and the other on the baptismal font, states its creation date of 1195. In the sixteenth century, however, the building was heavily reconstructed, leaving only the portico generally intact, albeit walled in. It remained enclosed until the building's modern restoration in 1928. The portico is heavily decorated, including a row of figural and vegetal capitals sculpted in the round, a carved alfiz, and numerous corbels.
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.