 When the building was transformed into a mosque from a cathedral , most of the previous Crusader construction was completely replaced , but the mosque 's facade with its arched entrance is a typical piece of Crusader ecclesiastical architecture , and columns within the mosque compound still retain their Italian Gothic style . Some of the columns have been identified as elements of an ancient synagogue , reused as construction material in the Crusader era and still forming part of the mosque . Internally , the wall surfaces are plastered and painted . Marble is used for the western door and the dome 's oculus . The floors are covered with glazed tiles . The columns are also marble and their capitals are built in Corinthian style . 
