Roman Catholic Diocese of Acerra Tags: Clerical Administrative Region, Diocese.The Diocese of Acerra (Latin: Dioecesis Acerrarum) is a Roman Catholic ecclesiastical territory in Campania southern Italy existing since the 11th century. It is a suffragan of the Archdiocese of Naples. thumbnail area (km2) 1.57e+08 country Italy Established 11th Century ( years ago) patron Alphonsus Maria de' Liguori province Roman Catholic Archdiocese of Naples Learn more... Loading...