The church was built in 1131 at the behest of the Norman King Ruggero II. The church is preceded by a large terraced courtyard that serves as the cemetery.
The facade is composed by two big towers with elegant mullioned windows and surmounted by pyramidal cusps different from each other: a square tower with battlements in the shape of flames, which would symbolize the Pope's miter and the power of the Church, while the other, octagonal and Ghibelline battlements symbolize the royal crown and the temporal power. The porch is composed by three arches supported by four columns.
The interior is divided into three aisles dominated by the solemn rhythm of the colonnade and the image of Christ Pantocrator in the apse.