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In page Pannonian Avars:
"By 600 the Avars had established a nomadic empire ruling over a multitude of peoples and stretching from modern Austria in the west to the Pontic–Caspian steppe in the east.[citation needed] After being defeated at the Battles of Viminacium in their homeland, some Avars defected to the Byzantines in 602, but Emperor Maurice decided not to return home as was customary.[3] He maintained his army camp beyond the Danube throughout the winter, but the hardship caused the army to revolt, giving the Avars a desperately needed respite and they attempted an invasion of northern Italy in 610. The Byzantine civil war prompted a Persian invasion in the Byzantine–Sasanian War, and after 615 the Avars enjoyed a free hand in the undefended Balkans.