Bay of Naples in the context of "Metropolitan City of Naples"

Roman concrete, also called opus caementicium, was used in construction in ancient Rome. Like its modern equivalent, Roman concrete was based on a hydraulic-setting cement added to an aggregate.

Many buildings and structures still standing today, such as bridges, reservoirs and aqueducts, were built with this material, which attests to both its versatility and its durability. Its strength was sometimes enhanced by the incorporation of pozzolanic ash where available (particularly in the Bay of Naples). The addition of ash prevented cracks from spreading. Recent research has shown that the incorporation of mixtures of different types of lime, forming conglomerate "clasts" allowed the concrete to self-repair cracks.

A grotto or grot is a natural or artificial cave or covered recess. Naturally occurring grottoes are often small caves near water that are usually flooded or often flooded at high tide. Sometimes, artificial grottoes are used as garden features. The Grotta Azzurra at Capri and the grotto at Tiberius' Villa Jovis in the Bay of Naples are examples of popular natural seashore grottoes.

Villa rustica (transl. farmhouse or countryside villa) was the term used by the ancient Romans to denote a farmhouse or villa set in the countryside and with an agricultural section, which applies to the vast majority of Roman villas. In some cases they were at the centre of a large agricultural estate, sometimes called a latifundium. The adjective rustica was used only to distinguish it from a much rarer sub-urban resort villa, or otium villa built for purely leisure and luxury, and typically located in the Bay of Naples. The villa rustica would thus serve both as a residence of the landowner and his family (and servants) and also as a farm management centre. It would often comprise separate buildings to accommodate farm labourers and sheds and barns for animals and crops.

The villa rustica's design differed, but usually it consisted of two parts; the pars urbana (main house), and the pars rustica (farm area).

John the Deacon (died after 910) was a religious writer who held a diaconate in the church of Saint Januarius Outside the Walls at Naples. From his writings appears to have been very learned. He wrote several historical works, important sources of information for the history of his time.

He first wrote a continuation of the diocesan chronicle of Naples (Gesta episcoporum Neapolitanorum), begun by another cleric, but which he brings down from 762 to 872. He makes use of both written and oral tradition, and contributes from personal knowledge. The narrative is graphic and spirited, and impresses the reader as a frank and accurate story. He also wrote a history of the translation in the fifth century of the remains of St. Severinus, the Apostle of Noricum, from the Castellum Lucullanum in the Bay of Naples to a new monastery within the city. This work contains the important account of the destruction of Taormina in Sicily by the Saracens under Ibrahim, and of the martyrdom of Bishop Procopius. When in 910 the relics of St. Sossius, a companion of St. Januarius, were transferred from the ruined Miseno to the same monastery at Naples, John wrote a history of St. Januarius and his companions, in which as an eyewitness he describes the aforesaid transfer. He also translated a biography of Nicholas of Myra from the Greek Methodius ad Theodorum.