[1][2] Comprising historically seven towns close to Rome, it was under the immediate jurisdiction of the Holy See.
Local legends place the conversion of Ferentino, Alatri, and neighboring towns in the apostolic age.
A named bishop of Alatri is Paschasius (551), who accompanied Pope Vigilius to Constantinople on the occasion of the controversy of the Three Chapters.
In the church of St. Mary Major in Alatri was preserved a wooden statue of the Madonna, an example of Roman art of the twelfth century.
[3] Erected: 6th Century Latin Name: Alatrinus Immediately Subject to the Holy See 30 September 1986 United with and suppressed to the Diocese of Anagni to form the Diocese of Anagni-Alatri