To the north of the Forth, the Pictish nations consisted at this time of the Kingdom of Fortriu to the north of the Mounth, and a Southern Pictish Zone, to the south, stretching as far as the Forth. Evidence from the 8th century Anglo-Saxon historian Bede points to the Picts also being subjugated by the Northumbrians during Oswald's reign, and that this subjugation continued into the reign of his successor, Oswiu.