See Muratori, Antiquit. Italiae Medii Aevi, tom. ii. Dissertat xxvii. p. 548. On one of these coins we read Hadrianus Papa (A.D. 772;) on the reverse, Vict. DDNN. with the word CONOB, which the Pére Joubert (Science des Medailles, tom. ii. p. 42) explains by CONstantinopoli Officina B (secunda.)