 A threat to the stability of the Byzantine Empire according to Procopius, Agathias and Menander, the Kutrigurs and Utigurs decimated one another.Some Kutrigur remnants were swept away by the Avars to Pannonia.By 569 the "Κοτζαγηροί" (Kotzagiroi, possibly Kutrigurs), "Ταρνιάχ" (Tarniach) and "Ζαβενδὲρ" (Zabender) fled to the Avars from the Türks.