St. Stephen's (or Esteban) is one of the oldest churches in Valencia. It is built in the Gothic style on the site of a mosque that stood in the city when it was under Muslim rule. It is a rather small church, not far from Valencia Cathedral.
According to one legend the site was that of an old Roman temple dedicated to Hercules. St. Stephen's was the notaries' church. The main church is open on Sundays and Holy Days of Obligation; the chapel is open daily for mass.
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.