San Nicolás church stands in the suburb of the same name outside the walls, a medieval quarter inhabited by Christians and dedicated to agriculture and sheep farming. It also had a large number of Mudejar residents. It was built in Caleno granite in the late-Romanesque style of Ávila between the second half of the 12th century and the beginning of the 13th. The upper end and porches remain from the original construction.
The three entrances take the form of semi-circular arches with archivolts. The northern entrance is the most ornamental and is decorated with wedges, palmettes and ivy leaves, which are very typical motifs on Romanesque churches in Zamora. The capitals of the archivolts have plant motifs.
The tower is built on to the upper end from the North. It is divided into three bodies and shows two periods of construction. A Vetton animal sculpture was reused for the plinth.
It has three naves: the central nave opens into a large apse and the side naves into rectangular chapels. Except for the upper end, the temple was covered with Baroque-style plasterwork in 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.