writing in his De Administrando Imperio (ca. 950 AD) "Patzinakia, the Pechenegs, stretches west as far as the Siret River (or even the Carpathian Mountains)
of Bogomilism (a dualist religious sect) and by assaults from Magyars, Pechenegs, the Rus, and Byzantines. Browning, Robert (1975). Byzantium and Bulgaria