Roman Catholic Diocese of Anagni-Alatri Tags: Clerical Administrative Region, Diocese.The Italian Catholic Diocese of Anagni (Latin: Dioecesis Anagnina-Alatrina) in Lazio has existed since 1986. In that year the Diocese of Alatri was united to the historical Diocese of Anagni. The diocese is a suffragan of the Diocese of Rome. thumbnail area (km2) 7.87e+08 country Italy Established 5th century Learn more... Loading...