The church as it is today is the sum of three distinct parts each different from the other in terms of typology and chronology. The construction of the primitive basilican church, made up of the central part with eight columns, two apses and facing east to west, dates to the first half of the 6th century A.D. and stands on the remains of a Roman building from the late Republican period.
It was originally dedicated to S. Severino. After the death of San Costanzo (8th century), around the 11th century, this structure, wich was preserved up to at least one meter above ground level, was converted to the Byzantine form with a Greek cross and covered with domed vaults.
Between 1330 and 1370, the structure was enlarged at the wish of Count Giacomo Arcucci, first by adding the current presbitery overlying a series of Roman bath areas, and later the pronaos by preexisting building, which were replaced by four columns, while the entrance was opened on the southern front.
In 1928, the building of a canonical house modified the scene created in 1370 and reproduced in a monochromatic water colour in 1840 by Giacinto Gigante, a Neapolitan artist from the Posillipo School.
From 987 onwards it was the episcopal seat. It was entrusted to a hermit in 1560, folllowing the transfer of the bishopric to St. Stephen's Cathedral.

How to reach
From the harbour of Marina Grande, proceed a short way along Via Provinciale Marina Grande (10 mins.).
From Capri, Piazzetta Martiri d'Ungheria, by taxi or pubic bus (10 mins.), or, from Piazza Umberto I, follow Via Acquaviva, Via San Costanzo and Via Provinciale Marina Grande (30 mins.).