Roman Catholic Archdiocese of Gaeta Tags: Clerical Administrative Region, Diocese.The Archdiocese of Gaeta (Latin: Archidioecesis Caietana) is a Roman Catholic ecclesiastical territory in southern Italy with its episcopal see in the city of Gaeta in the Lazio region. The diocese is suffragan of the Diocese of Rome. thumbnail area (km2) 6.03e+08 country Italy Established 8th century Learn more... Loading...