Pope St. Adeodatus I (or Pope St. Deusdedit), papal bull seal: “Deusdedit Papæ” [The obverse of his seal shows Christ the Good Shepherd with the inscription] “A　Ω” [Alpha and Omega]. (Leo A. Kelly in his article on Pope St. Deusdedit, printed in The Catholic Encyclopedia, Vol. 4. New York: Robert Appleton Company, 1908.)