The Catacombs of San Gennaro are underground paleo-Christian burial and worship sites in Naples, Italy, carved out of tuff, a porous stone. They are situated in the northern part of the city, on the slope leading up to Capodimonte, consisting of two levels, San Gennaro Superiore, and San Gennaro Inferiore.
Originally, there were three separate cemeteries, dedicated, to Saint Gaudiosus (San Gaudioso), Saint Severus (San Severo) and St. Januarius (San Gennaro). These catacombs in Naples are different from their Roman counterparts in that they have more spacious passageways along two levels. The lower level is the oldest, going back to the 3rd-4th century and may actually be the site of an earlier pre-Christian cemetery later ceded to the new sect. It apparently became an important religious burial site only after the entombment there of Bishop Agrippinus. The second level was the one expanded so as to encompass the other two adjacent cemeteries.
The foundation of San Gennaro extra Moenia church is connected with the catacombs. The first structure was probably the result of the fusion of two ancient burial sites, one from the 2nd century CE that contained the remains of Saint Agrippinus of Naples, the first patron saint of Naples, and the site from the 4th century CE that contained the remains of St. Januarius, the patron saint of the city.
The site was consecrated to Gennaro (Januarius) in the fifth century on the occasion of the entombment there of his remains, which were later removed to the Cathedral of Naples by Bishop John IV (842-849) in the 9th century. As the burial areas grew around the remains of Gennaro so did underground places of worship for the growing Christian faith. An early example of religious use of the catacombs is the Basilica of Agrippinus dating to the fourth century. An altar and chair are carved from the tuff creating a meeting place for worshipers. Other ritual spaces included a confessional, baptismal font, a carved tuff table used as a seat for a consignatorium (area for confirmation), or oleorum table for holy oils, and possibly, monastic and hermit cells.
Until the eleventh century the catacombs were the burial site of Neapolitan bishops, including Quodvoltdeus, the exiled bishop of Carthage who died in 450 AD. Between the 13th and 18th century, the catacombs were the victim of severe looting. Restoration of the catacombs was made possible only after the transfer of skeletal remains to another cemetery. During WWII the catacombs were used by the local population as a place of shelter. The Catacombs were reopened in 1969 by the Archbishop of Naples and modern excavations started in 1971.
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.