Very soon afterwards the same policy was again followed in dealing with the Franks, who were plundering and depopulating the Belgic provinces of Gaul further to the north, and ravaging the coasts of Britain. [p284] In 286, Carausius, who was put in charge of the Roman fleet, and whose business it was to guard the Gallic and British shores infested by the Saxons and Franks, revolted and proclaimed himself Emperor, defending himself successfully against the Emperor Maximian, and leaguing himself with the Franks and Saxons. In 291, Maximian, after directing his arms against the Franks, deported a number of them and settled them as læti on the vacant lands of the Nervii and Treviri, in Belgic Gaul and in the valley of the Moselle.[410]

Further deportations of Franks, Frisians, and Chamavi.

The further steps taken by his co-Cæsar Constantius to put an end to the revolt of Carausius are very instructive. He first recovered the haven of Gesoriacum (Boulogne), and cut off the connexion of the British fleet with Gaul. Then he turned northward again upon the districts from whence the Frankish and Saxon pirates had been accustomed to make their ravages upon Britain and Gaul. They were, as has been said, in league with the British usurper, but succumbed to the arms of Constantius. The first use he made of his victory over them was to repeat the policy of his predecessors—to deport a great multitude into those very Belgic districts which they had depopulated by their ravages. This was the time when the districts around Amiens and Beauvais, once inhabited by the Bellovaci, and further south around Troyes and Langres, where the Tricassi and Lingones had dwelt, were colonised by Franks, [p285] Chamavi, and Frisians; and Eumenius,[411] in his Panegyric, represented them, as Probus had described the Alamanni, as now tilling the fields they had once plundered, and supplying recruits to the Roman legions. A 'pagus Chamavorum' existed in the ninth century in this district, and so bore witness to the extent and permanence of this colony of Chamavi.[412] Similar evidence for the other districts, as we shall have occasion to see hereafter, is possibly to be found in the names of places with a Teutonic termination remaining to this day, though the language spoken is French.

A recent German writer, in a sketch of the reign of Diocletian, makes the pregnant remark that when account is taken of all the masses of Germans thus brought into the Roman provinces, partly as colonists and partly as soldiers, it becomes clear that the northern districts of Gaul were already half German before the Frankish invasion. These German settlers were valuable at the time as tillers of the land, payers of tribute, and as furnishing recruits to the legions; but in history they were more than this, for they were, partly against their will, the pioneers of the German 'Völkerwanderung.' [413]

Alamanni in Britain.

We have seen that Probus had deported Alamanni into Britain in pursuance of this continuous [p286] policy. It is curious to observe that when Constantius soon after (in A.D. 306) died at York, and Constantine was proclaimed Emperor in Britain, one of his supporters was Crocus or Erocus,[414] a king of the Alamanni, proving that there were Alamannic soldiers in Britain under their own king—probably, more properly speaking, a sept or clan under its own chief—at that date.

But it was not long before both the Alamanni and the Franks again became troublesome in the Rhine valley. Under the year 357, in the history of Ammianus Marcellinus, there is a vivid description of the struggle of Julian to regain from the Alamanni the cities on the Lower Rhine which the latter had occupied, as in the time of Probus, within the Roman province of Lower Germany. After the decisive battle of Strasburg, Julian crossed the Rhine at Mayence and laid waste the country between the Maine and the Rhine, 'plundering the wealthy farms of their crops and cattle, and burning to the ground all the houses, which latter in that district were built in the Roman fashion.' [415] He then restored the fortress of Trajan which protected this part of the 'Limes.' The next year, the Salian Franks having taken possession of Toxandria, on the Scheldt, Julian pounced down upon them and recovered possession, and then set himself 'to restore the fortifications of the cities of the Lower Rhine, and to establish afresh the granaries which had been burned, in which to stow [p287] the corn usually imported from Britain.' [416] This was the occasion on which, according to Zosimus, 800 vessels, more than mere boats, were employed in going backwards and forwards bringing over the British corn, thus proving both the extent of British agriculture and the close connexion between Britain and the province of Lower Germany.

Bucenobantes deported into Britain.

The aggressions of the Alamanni, however, continued, and again we find Ammianus Marcellinus describing how, at the close of a campaign, Valentinian, in A.D. 371, deported into Britain the Bucenobantes, a tribe of the Alamanni from the east banks of the Rhine, immediately north of Mayence. He made them elect Fraomarius as their chief, and then, giving him the rank of a tribune, sent him with his tribe of Alamannic soldiers to settle in Britain, as probably Crocus or Erocus had been sent before him.[417]

The policy a settled one, and long continued.