The reign of Maurice was troubled by almost unending wars on all frontiers, and despite his excellent ruling qualities he could only temporarily prevent the disintegration of the great empire of Justinian.
Shortly after his accession, he luckily interfered in a Persian war of succession and gained Armenia. But the Balkan provinces were thoroughly devastated by the Slavs in his days, never to recover. The Slavs penetrated all the way into Peloponnesus, and several successful but exhausting campaigns had to be directed against them. In the west, he organized the threatened Byzantine dominions in Italy and Africa into exarchates, ruled by military governors or exarchs.
Tiberius II Constantine