Nikephoros has conducted successful campaigns during 807-809…
809 CE
Nikephoros has conducted successful campaigns during 807-809 against the Bulgarians, who are harassing the empire’s northern frontiers.
Despite the imperial successes, Bulgarian khan Krum seizes Serdica in 809 and incorporates the former imperial possession as a part of the Bulgarian state; it is given the Slav name Sredets (Greek: Triaditsa).