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No traces of the medieval basilica remain in the present 18th-century building; only an epigraph has survived that was donated by Cardinal Count Casate (c. 1287), it notes the consecration of the altar by Pope Alexander IV in 1256. The elements belonging to the previous building can only be deduced from graphic and textual sources: a three-nave basilica with three apses attributable to the time of Pope Gregory III (731-741), the bell tower probably added in the 12th century, and parts of the presbytery furnishings with the high altar erected above a confessio and surmounted by a ciborium with a gabled roof from the mid-13th century.