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The Byzantine–Bulgarian wars of 756–775 (Българо–византийска война от 756–775) were a series of conflicts between Bulgaria and the Byzantine Empire under Constantine V. An able general and administrator, Constantine V achieved significant successes against the Arabs in Asia Minor and was able to reinforce the Empire's presence in the Balkans. In Bulgaria, the third quarter of the 8th century was a period of internal turmoil, plagued with constant rivalry for the throne among the leading noble clans. Over the course of the war eight Khans ruler the country, and all of them were deposed.

In 19 years Constantine V led nine campaigns, defeating the Bulgarians at Marcellae in 756, Anchialus in 763 and Berzitia in 774, but losing the battle of the Rishki Pass in 759. Both sides suffered heavy casualties and in addition the Byzantines lost hundreds of ships to storms in the Black Sea. Despite the internal instability of Bulgaria and the huge military effort of the Byzantine Empire with its larger manpower, wealth and resources, the young Bulgarian state did not collapse and proved to be a dangerous rival of the Byzantines in the Balkans. In 774 the Bulgarian khan Telerig outmanoeuvred Constantine V by convincing him to expose the Byzantine spies in the Bulgarian capital Pliska who were duly eliminated. The next year Constantine V died during a retaliatory campaign against Bulgaria.

The sources about the Byzantine–Bulgarian relations in the following 14 years are obscure. In 789 the hostilities were renewed and the Bulgarians scored an important victory in the battle of Marcellae in 792, which marked the end of the internal turmoil and the consolidation of the country under khan Kardam.