Aix Cathedral in Aix-en-Provence in southern France is a Roman Catholic church and the seat of the Archbishop of Aix-en-Provence and Arles. The cathedral is built on the site of the 1st-century Roman forum of Aix. Built and re-built from the 12th until the 19th century, it includes Romanesque, Gothic and Neo-Gothic elements, as well as Roman columns and parts of the baptistery from a 6th-century Christian church. It is a national monument of France.