The church is ancient, founded perhaps in the 5th or 6th century, in a territory inhabited in those times by Bulgar immigrants. The church has a basilica layout with three naves. It may have formerly been a barracks in Ancient Roman times for the Ad Pirum Filumeni. The crypt has a 6th-century sarcophagus that supposedly held the body of St Gervasius, patron of the town.
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