 New regional centers, such as those near Ozora and Igar—county Fehér in Hungary—appeared.This strengthened the Avars' power base, although most of the Balkans now lay in the hands of Slavic tribes since neither the Avars nor Byzantines were able to reassert control.A new type of ceramics—the so-called "Devínska Nová Ves" pottery—emerged at the end of the 7th century in the region between the Middle Danube and the Carpathians.