Santa Cruz de Cangas de Onís is a small Roman Catholic chapel in Cangas de Onís, the first capital of the Kingdom of Asturias. It was founded on an artificial mound (a pagan dolmen) by Favila, second king of Asturias, and his queen, Froiliuba. It was begun in 737 and consecrated that same year on 27 October according to its original foundation stone, which has been called the first literary monument of the Reconquista.
Santa Cruz originally housed the Cruz de la Victoria, an oak cross supposedly carried by Pelagius, Favila's father, at the Battle of Covadonga. It was probably the first church constructed after the Islamic invasion of Spain in 711.
The church was completely rebuilt on two occasions. First in 1632 and again after its destruction in the Spanish Civil War (1936). Then, local authorities decided to uncover the dolmen beneath it, which had been obscured by a church since the fourth century, when the first chapel was put up on that site. Of the original building only the foundation stone survives.
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.