Irene of Athens
Military campaigns in northern Greece in 758 under Constantine V (r. 741–775) prompted a relocation of Slavs under Bulgar aggression; again in 783. The Bulgars had by 773 cut off the communication route, the Vardar valley, between Serbia and the Byzantines. The Bulgars were defeated in 774, after Emperor Constantine V (r. 741–775) learnt of their planned raid. In 783, a large Slavic uprising took place in the Byzantine Empire, stretching from Macedonia to the Peloponnese, which was subsequently quelled by Byzantine "patrikios" Staurakios (fl. 781–800). Dalmatia, inhabited by Slavs in the interior, at this time, had firm relations with Byzantium. In 799, Akameros, a Slavic archon, participated in the conspiracy against Empress Irene of Athens.