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[ Panegyr. v. 12. Britain at this time was secure, and slightly guarded.]
When Britain was thus dismembered from the empire, its importance was sensibly felt, and its loss sincerely lamented. The Romans celebrated, and perhaps magnified, the extent of that noble island, provided on every side with convenient harbors; the temperature of the climate, and the fertility of the soil, alike adapted for the production of corn or of vines; the valuable minerals with which it abounded; its rich pastures covered with innumerable flocks, and its woods free from wild beasts or venomous serpents. Above all, they regretted the large amount of the revenue of Britain, whilst they confessed, that such a province well deserved to become the seat of an independent monarchy. [27] During the space of seven years it was possessed by Carausius; and fortune continued propitious to a rebellion supported with courage and ability. The British emperor defended the frontiers of his dominions against the Caledonians of the North, invited, from the continent, a great number of skilful artists, and displayed, on a variety of coins that are still extant, his taste and opulence. Born on the confines of the Franks, he courted the friendship of that formidable people, by the flattering imitation of their dress and manners. The bravest of their youth he enlisted among his land or sea forces; and, in return for their useful alliance, he communicated to the barbarians the dangerous knowledge of military and naval arts. Carausius still preserved the possession of Boulogne and the adjacent country. His fleets rode triumphant in the channel, commanded the mouths of the Seine and of the Rhine, ravaged the coasts of the ocean, and diffused beyond the columns of Hercules the terror of his name. Under his command, Britain, destined in a future age to obtain the empire of the sea, already assumed its natural and respectable station of a maritime power. [28]
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[ Panegyr. Vet v 11, vii. 9. The orator Eumenius wished to exalt the glory of the hero (Constantius) with the importance of the conquest. Notwithstanding our laudable partiality for our native country, it is difficult to conceive, that, in the beginning of the fourth century England deserved all these commendations. A century and a half before, it hardly paid its own establishment.]
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[ As a great number of medals of Carausius are still preserved, he is become a very favorite object of antiquarian curiosity, and every circumstance of his life and actions has been investigated with sagacious accuracy. Dr. Stukely, in particular, has devoted a large volume to the British emperor. I have used his materials, and rejected most of his fanciful conjectures.]
By seizing the fleet of Boulogne, Carausius had deprived his master of the means of pursuit and revenge. And when, after a vast expense of time and labor, a new armament was launched into the water, [29] the Imperial troops, unaccustomed to that element, were easily baffled and defeated by the veteran sailors of the usurper. This disappointed effort was soon productive of a treaty of peace. Diocletian and his colleague, who justly dreaded the enterprising spirit of Carausius, resigned to him the sovereignty of Britain, and reluctantly admitted their perfidious servant to a participation of the Imperial honors. [30] But the adoption of the two Cæsars restored new vigor to the Romans arms; and while the Rhine was guarded by the presence of Maximian, his brave associate Constantius assumed the conduct of the British war. His first enterprise was against the important place of Boulogne. A stupendous mole, raised across the entrance of the harbor, intercepted all hopes of relief. The town surrendered after an obstinate defence; and a considerable part of the naval strength of Carausius fell into the hands of the besiegers. During the three years which Constantius employed in preparing a fleet adequate to the conquest of Britain, he secured the coast of Gaul, invaded the country of the Franks, and deprived the usurper of the assistance of those powerful allies.
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[ When Mamertinus pronounced his first panegyric, the naval preparations of Maximian were completed; and the orator presaged an assured victory. His silence in the second panegyric might alone inform us that the expedition had not succeeded.]