The present Romanesque Revival building, originally called the Tempio della Conciliazione ("Temple of Conciliation"), was constructed in the 1930s, replacing the medieval church of San Cetteo.
The medieval church of St. Cetteus (Italian: Chiesa di San Cetteo) that formerly stood on the site had fallen into such disrepair that it was demolished (a few traces of the old building can be seen on the pavement opposite).
[4] The original name of the new building, the Tempio della Conciliazione ("Temple of Conciliation"), is connected to the Lateran Pacts of 1929, marking the agreements made between the Italian Fascist government and the Vatican.
Adjoining the west front to the north, the campanile consists of an octagonal upper storey on a square base, while to the south is a small baptistry.
[5] In the other is the tomb of d'Annunzio's mother, Luisa De Benedictis, to which the sculptor Arrigo Minerbi contributed the funeral monument, consisting of an arch on which lies the figure of a young woman asleep.