The thirty years which followed the death of Justinian are covered by three reigns, those of Justinus II. [565-578], Tiberius Constantinus [578-582], and Maurice [582-602]. These three emperors were men of much the same character as the predecessors of Justinian; each of them was an experienced official of mature age, who was selected by the reigning emperor as his most worthy successor. Justinus was the favourite nephew of Justinian, and had served him for many years as Curopalates, or Master of the Palace. Tiberius Constantinus was “Count of the Excubiti,” a high Court officer in the suite of Justinus: Maurice again served Tiberius as “Count of the Fœderati,” or chief of the Barbarian auxiliaries. They were all men of capacity, and strove to do their best for the empire: historians concur in praising the justice of Justinus, the liberality and humanity of Tiberius, the piety of Maurice. Yet under them the empire was steadily going down hill: the exhausting effects of the reign of Justinian were making themselves felt more and more, and at the end of the reign of Maurice a time of chaos and disaster was impending, which came to a head under his successor. The internal causes of the disaster of this time were the weakening of the empire by the great plague of 544 and still more by the grinding exactions of Justinian’s financial system. Its external phenomena were invasions by new hordes from the north, combined with long and exhausting wars with Persia. The virtues of the emperors seem to have helped them little: Justin’s justice made him feared rather than loved; Tiberius’s liberality rendered him popular, but drained the treasury; Maurice, on the other hand, who was economical and endeavoured to fill the coffers which his predecessors had emptied, was therefore universally condemned as avaricious. The troubles on the frontier which vexed the last thirty years of the sixth century were due to three separate sets of enemies—the Lombards in Italy, the Slavs and Avars in the Balkan Peninsula, and the Persians in the East.