DATIUS (Saint) Bishop (January 14) (6th century) Of the illustrious family of the Alliati, he, because of his piety and learning, was appointed Archbishop of Milan. He was of invaluable assistance to Pope Vigilius in the dispute about the “Three Chapters.” In A.D. 551 he took part in the Council of Constantinople and in the condemnation of the Patriarch Mennas. In consequence he was ill-treated by the Emperor Justinian. He died A.D. 552, a few months after his return to his See. Saint Gregory the Great speaks of him in terms of honour and esteem, and many miracles are attributed to his intercession. He is said to have ordered to be written the History of the Church of Milan known as the “Historia Datiana”.