Some Severians settled in the territory of present-day northeastern Bulgaria, (Moesia Inferior, and Scythia Minor). According to Theophanes the Confessor, the Bulgars subjugated the so-called Seven Slavic tribes. One of these tribes, the Severeis, were resettled in the east from the klisuras before Veregava (), most likely the Rish Pass of the Balkan Mountains; while the other six tribes were resettled in the southern and western regions, as far the boundary with the Pannonian Avars. In 767, the Byzantines kidnapped the Severian prince Slavun, who had made trouble in Thrace, indicating they retained a tributary relationship with the Bulgars.