Constantine IV is the emperor in accounts of the war against Asparuh. Army and fleet operated near difficult marshy terrain. Later writers connect the emperor’s departure with rumours and flight in the army; they were not eyewitnesses. His coin image represents authority, rather than an episode of the campaign. Led a campaign against the Bulgars near Onglos. Left the camp according to later accounts. The empire made peace with the Bulgars. Accounts of him are central to the date 681, but require critical comparison.
History of Bulgaria
