766 Wreck of the Roman fleet at the mouth of the Danube. Edicts against image-worship extended and vigorously enforced.
773-774 Campaigns against the Bulgarians. Victory of Lithosoria. Peace made with the Bulgarian monarch, which Constantine breaks.
775 Leo IV, son of Constantine, succeeds him. He is a zealous iconoclast. He marries the empress Irene.
778 Successful campaign against the Bulgarians.
780 Capture of Semaluos by Harun-ar-Rashid. Death of Leo. Irene becomes regent for the ten-year-old Constantine VI.
781 Revolt of Elpidius in Sicily.
782 The Mohammedans under Harun-ar-Rashid invade Asia Minor.
787 Council of Nicæa sanctions image-worship.
788 The Bulgarians gain a victory at the Strymon.
789 The Arabs invade Rumania.