Bede's Ecclesiastical History of England, ed. by A.M. Sellar, [1907]
OSWALD, the most Christian king of the Northumbrians, reigned nine years, including that year which was held accursed for the barbarous cruelty of the king of the Britons and the reckless apostacy of the English kings; for, as was said above,it is agreed by the unanimous consent of all, that the names and memory of the apostates should be erased from the catalogue of the Christian kings, and no year assigned to their reign.