But there was a danger likewise in refusing the empire; and from the moment that Maximus had violated his aliegiance to his lawful sovereign, he could not hope to reign, or even to live, if he confined his moderate ambition within the narrow limits of Britain. He boldly and wisely resolved to prevent the designs of Gratian; the youth of the island crowded to his standard, and he invaded Gaul with a fleet and army, which were long afterwards remembered as the emigration of a considerable part of the British nation. Ref. 014 The emperor, in his peaceful residence of Paris, was alarmed by their hostile approach; and the darts which he idly wasted on lions and bears might have been employed more honourably against the rebels. But his feeble efforts announced his degenerate spirit and desperate situation, and deprived him of the resources which he still might have found in the support of his subjects and allies. The armies of Gaul, instead of opposing the march of Maximus, received him with joyful and loyal acclamations; and the shame of the desertion was transferred from the people to the prince. The troops whose station more immediately attached them to the service of the palace abandoned the standard of Gratian the first time that it was displayed in the neighbourhood of Paris. The emperor of the West fled towards Lyons, with a train of only three hundred horse; and in the cities along the road, where he hoped to find a refuge, or at least a passage, he was taught, by cruel experience, that every gate is shut against the unfortunate. Yet he might still have reached in safety the dominions of his brother, and soon have returned with the forces of Italy and the East, if he had not suffered himself to be fatally deceived by the perfidious governor of the Lyonese province. Gratian was amused by protestations of doubtful fidelity and the hopes of a support which could not be effectual, till the arrival of Andragathius, the general of the cavalry of Maximus, put an end to his suspense. That resolute officer executed without remorse the orders, or the intentions, of the usurper. Gratian, as he rose from supper, was delivered into the hands of the assassin; and his body was denied to the pious and pressing entreaties of his brother Valentinian. Ref. 015 The death of the emperor was followed by that of his powerful general Mellobaudes, the king of the Franks; who maintained, to the last moment of his life, the ambiguous reputation which is the just recompense of obscure and subtle policy. Ref. 016 These executions might be necessary to the public safety; but the successful usurper, whose power was acknowledged by all the provinces of the West, had the merit and the satisfaction of boasting that, except those who had perished by the chance of war, his triumph was not stained by the blood of the Romans. Ref. 017
The events of this revolution had passed in such rapid succession that it would have been impossible for Theodosius to march to the relief of his benefactor, before he received the intelligence of his defeat and death. During the season of sincere grief, or ostentatious mourning, the Eastern emperor was interrupted by the arrival of the principal chamberlain of Maximus; and the choice of a venerable old man, for an office which was usually exercised by eunuchs, announced to the court of Constantinople the gravity and temperance of the British usurper. The ambassador condescended to justify, or excuse, the conduct of his master, and to protest in specious language that the murder of Gratian had been perpetrated, without his knowledge or consent, by the precipitate zeal of the soldiers. But he proceeded, in a firm and equal tone, to offer Theodosius the alternative of peace or war. The speech of the ambassador concluded with a spirited declaration that, although Maximus, as a Roman and as the father of his people, would choose rather to employ his forces in the common defence of the republic, he was armed and prepared, if his friendship should be rejected, to dispute in a field of battle the empire of the world. An immediate and peremptory answer was required; but it was extremely difficult for Theodosius to satisfy, on this important occasion, either the feelings of his own mind or the expectations of the public. The imperious voice of honour and gratitude called aloud for revenge. From the liberality of Gratian he had received the Imperial diadem: his patience would encourage the odious suspicion that he was more deeply sensible of former injuries than of recent obligations; and, if he accepted the friendship, he must seem to share the guilt, of the assassin. Even the principles of justice and the interest of society would receive a fatal blow from the impunity of Maximus; and the example of successful usurpation would tend to dissolve the artificial fabric of government, and once more to replunge the empire in the crimes and calamities of the preceding age. But, as the sentiments of gratitude and honour should invariably regulate the conduct of an individual, they may be overbalanced in the mind of a sovereign by the sense of superior duties; and the maxims both of justice and humanity must permit the escape of an atrocious criminal, if an innocent people would be involved in the consequences of his punishment. The assassin of Gratian had usurped, but he actually possessed, the most warlike provinces of the empire; the East was exhausted by the misfortunes, and even by the success, of the Gothic war; and it was seriously to be apprehended that, after the vital strength of the republic had been wasted in a doubtful and destructive contest, the feeble conqueror would remain an easy prey to the Barbarians of the North. These weighty considerations engaged Theodosius to dissemble his resentment and to accept the alliance of the tyrant. But he stipulated that Maximus should content himself with the possession of the countries beyond the Alps. The brother of Gratian was confirmed and secured in the sovereignty of Italy, Africa, and the Western Illyricum; and some honourable conditions were inserted in the treaty, to protect the memory and the laws of the deceased emperor. Ref. 018 According to the custom of the age, the images of the three Imperial colleagues were exhibited to the veneration of the people: nor should it be lightly supposed that, in the moment of a solemn reconciliation, Theodosius secretly cherished the intention of perfidy and revenge. Ref. 019
The contempt of Gratian for the Roman soldiers had exposed him to the fatal effects of their resentment. His profound veneration for the Christian clergy was rewarded by the applause and gratitude of a powerful order, which has claimed, in every age, the privilege of dispensing honours both on earth and in heaven. Ref. 020 The orthodox bishops bewailed his death and their own irreparable loss; but they were soon comforted by the discovery that Gratian had committed the sceptre of the East to the hands of a prince whose humble faith and fervent zeal were supported by the spirit and abilities of a more vigorous character. Among the benefactors of the church, the fame of Constantine has been rivalled by the glory of Theodosius. If Constantine had the advantage of erecting the standard of the cross, the emulation of his successor assumed the merit of subduing the Arian heresy and of abolishing the worship of idols in the Roman world. Theodosius was the first of the emperors baptised in the true faith of the Trinity. Although he was born of a Christian family, the maxims, or at least the practice,