The first church was built in the 9th century on the ruins of an earlier temple, and a second followed in the 10th. They merged into a six-aisle Romanesque church in the 12th century. The bell tower was begun in 1180 and finished over a century later, with majolica tiles. The crypt was completed in 1208, when the relics of Saint Andrew were transferred. Bronze doors were cast in Constantinople before 1066.
The nave was decorated in Baroque style in the 18th century. The facade partly collapsed in 1861, and Errico Alvino's rebuilt Norman-Arab-Byzantine facade was completed in 1891, with mosaics from designs by Domenico Morelli. The infobox lists Romanesque-Baroque-Rococo.
A flight of 62 steps leads to the doors. It is an active cathedral, and the first church houses the Diocesan Museum.

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