“Non est a Graecis Romanus vilis tenendus locus quia recessit inde imperator Constantinus, verum eo magis colendus, venerandus, adorandus quia venerunt illuc Apostoli, doctores sancti, Petrus et Paulus (Liutprand of Cremona: Relatio de Legatione Constantinopolitanâ, chap. lxii).”
Roughly “The Greeks should not show contempt for the city of Rome because she was abandoned by the Emperor Constantine. They should rather revere and adore the city to which came the Apostles Saints Peter and Paul.”
A Study of History, Vol VIII, OUP, 1954 (footnote)