For the empire as a whole this interregnum of anarchy came to an end in the year 284 when Diocletian, the second Augustus, ascended the throne. This man, of obscure, even of servile origin, showed statesmanship of a rare order, rescuing the water-logged and all-but foundering vessel of the state from destruction, and steering it into a harbour in which it rode safely for a hundred years. His chief expedient was the division of the imperial power, in recognition of the fact that the vast fabric of the empire could no longer be upheld by a single ruler, and that if the supreme Augustus would not have rivals he must have partners. Dividing the empire into four great sections called prefectures, he chose for himself the prefecture of the East, including Egypt, Syria, Asia Minor and Thrace. His contemporary and colleague, the stout old soldier Maximian, who, like himself, bore the title of Augustus, ruled Italy, southern Germany and the greater part of Roman Africa. After Diocletian had reigned seven years he associated with himself in addition two junior partners, not Augusti but merely Cæsars; Galerius who governed the Illyrian lands, which in the meaning then given to the name stretched from Cape Matapan to the Danube. To the youngest of all, Constantius Chlorus, was assigned the prefecture of the west, stretching from Tangier to Hexham, and including three great “Dioceses” as the divisions intermediate between prefectures and provinces were called: Western Africa and Spain, Gaul and Britain. A noble portion was this, for the junior partner of the imperial firm, and one which might have satisfied the ambition even of a Napoleon. But there was one annoying drawback to the greatness of the western Cæsar. After all the rest of the empire had been restored to tranquillity the island of Britain still remained outside the imperial orbit, and what made this circumstance the more exasperating was the remembrance that it was due to the treachery of an officer chosen by the emperors themselves. Desiring to check the piratical expeditions of the Franks and Saxons who were already beginning to infest both coasts of the British channel, Maximian, who was at that time ruling and warring in Gaul, had entrusted the command of a naval squadron to a certain Carausius, a man of mean extraction, born either in Flanders or Ireland,[17] who had already distinguished himself by his bravery and his skill in naval warfare. From his strong place of arms at Gesoriacum (Boulogne), Carausius soon made his power felt by the barbarians, but before long Maximian had reason to suspect that the officer of the empire was himself in secret league with at least some of the pirates and shared their plunder. He summoned Carausius to appear before him, but that astute personage, suspecting the motive for the summons, hastily quitted Boulogne and sailed for Britain, which in the disorganised condition of Roman affairs he had not much difficulty in making his own.