The successors of Justinian continued his policy of concentrating civilian and military power in the hands of a single individual. Maurice (582-602) transformed the old Prefectures of Italia and Africa into Exarchates governed by an Exarch, who held both civilian and military authority. The vicars and other civilian officials seem to have lost most of their importance to the exarchs and their subordinates, but did not disappear until the middle of the 7th century AD. After 557, there is no record of "vicarii" in Italia, but two "agentes vices" of the Praetorian Prefect of Italia with their seats in Genova and Rome are mentioned in Pope Gregory I's letters. These Italian "agentes vices" are no longer attested after the first half of the seventh century.