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One of the oldest churches in Palermo preserved to this day, inscribed with other Norman-Byzantine monuments on the UNESCO list. The church was built in the 6th century, but during the Arab rule it was turned into a mosque. Its current appearance is the result of a reconstruction which was ordered by King Roger II in the 12th century. The nave and presbytery were then covered with red domes, and cloisters were added to the temple, which are probably the remains of a monastery.