Naples Cathedral (Duomo di Napoli) or or the Cathedral of the Assumption of Mary

The architectural style of the cathedral is Angevin gothic style (Italian: gotico angioino). There are archaeological remains in the crypt of the neighboring original palaeochristian church of Santa Restituta where there is a Greek wall belonging to the temple of Apollo. Under the apse the peristyle of a late imperial domus can be seen; also a stretch of Roman aqueduct after the foundation of the city and a stretch of Greek road on an inclined plane.

Inside the cathedral is the Royal Chapel of the Treasure of San Gennaro, with frescoes by many Italian and French masters of the 14thCentury.

The church houses a vial of the blood of Saint Januarius, which is brought out three times a year, on the first Saturday in May, on 19 September and 16 December, when the dried blood usually liquefies. If the blood fails to liquefy, then legend has it that disaster will befall Naples.

Naples Cathedral is a Roman Catholic cathedral, the main church of Naples, southern Italy. It is widely known as the Cathedral of Saint Januarius (Cattedrale di San Gennaro), in honour of the city's patron saint.  The present cathedral was commissioned by King Charles I of Anjou. Construction continued during the reign of his successor, Charles II (1285–1309) and was completed in the early 14th century under Robert of Anjou. It was built on the foundations of two palaeo-Christian basilicas, whose traces can still be clearly seen. Underneath the building excavations have revealed Greek and Roman artifacts.