The reign of Maximus might have ended in peace and prosperity, could he have contented himself with the possession of three ample countries, which now constitute the three most flourishing kingdoms of modern Europe. But the aspiring usurper, whose sordid ambition was not dignified by the love of glory and of arms, considered his actual forces as the instruments only of his future greatness, and his success was the immediate cause of his destruction. The wealth which he extorted Ref. 075 from the oppressed provinces of Gaul, Spain, and Britain was employed in levying and maintaining a formidable army of Barbarians, collected, for the most part, from the fiercest nations of Germany. The conquest of Italy was the object of his hopes and preparations; and he secretly meditated the ruin of an innocent youth, whose government was abhorred and despised by his Catholic subjects. But, as Maximus wished to occupy, without resistance, the passes of the Alps, he received, with perfidious smiles, Domninus of Syria, the ambassador of Valentinian, and pressed him to accept the aid of a considerable body of troops for the service of a Pannonian war. The penetration of Ambrose had discovered the snares of an enemy under the professions of friendship; Ref. 076 but the Syrian Domninus was corrupted, or deceived, by the liberal favour of the court of Treves; and the council of Milan obstinately rejected the suspicion of danger, with a blind confidence which was the effect, not of courage, but of fear. The march of the auxiliaries was guided by the ambassador; and they were admitted, without distrust, into the fortresses of the Alps. But the crafty tyrant followed, with hasty and silent footsteps, in the rear; and, as he diligently intercepted all intelligence of his motions, the gleam of armour and the dust excited by the troops of cavalry first announced the hostile approach of a stranger to the gates of Milan. In this extremity, Justina and her son might accuse their own imprudence and the perfidious arts of Maximus; but they wanted time, and force and resolution to stand against the Gauls and Germans, either in the field or within the walls of a large and disaffected city. Flight was their only hope, Aquileia their only refuge; and, as Maximus now displayed his genuine character, the brother of Gratian might expect the same fate from the hands of the same assassin. Maximus entered Milan in triumph; and, if the wise archbishop refused a dangerous and criminal connection with the usurper, he might indirectly contribute to the success of his arms by inculcating, from the pulpit, the duty of resignation rather than that of resistance. Ref. 077 The unfortunate Justina reached Aquileia in safety; but she distrusted the strength of the fortifications; she dreaded the event of a siege; and she resolved to implore the protection of the great Theodosius, whose power and virtue were celebrated in all the countries of the West. A vessel was secretly provided to transport the Imperial family; they embarked with precipitation in one of the obscure harbours of Venetia or Istria; traversed the whole extent of the Hadriatic and Ionian seas; turned the extreme promontory of Peloponnesus; and, after a long but successful navigation, reposed themselves in the port of Thessalonica. All the subjects of Valentinian deserted the cause of a prince who, by his abdication, had absolved them from the duty of allegiance; and, if the little city of Æmona, on the verge of Italy, had not presumed to stop the career of his inglorious victory, Maximus would have obtained, without a struggle, the sole possession of the Western empire.
Instead of inviting his royal guests to the palace of Constantinople, Theodosius had some unknown reasons to fix their residence at Thessalonica; but these reasons did not proceed from contempt or indifference, as he speedily made a visit to that city, accompanied by the greatest part of his court and senate. After the first tender expressions of friendship and sympathy, the pious emperor of the East gently admonished Justina that the guilt of heresy was sometimes punished in this world as well as in the next; and that the public profession of the Nicene faith would be the most efficacious step to promote the restoration of her son, by the satisfaction which it must occasion both on earth and in heaven. The momentous question of peace or war was referred, by Theodosius, to the deliberation of his council; and the arguments which might be alleged on the side of honour and justice had acquired, since the death of Gratian, a considerable degree of additional weight. The persecution of the Imperial family, to which Theodosius himself had been indebted for his fortune, was now aggravated by recent and repeated injuries. Neither oaths nor treaties could restrain the boundless ambition of Maximus; and the delay of vigorous and decisive measures, instead of prolonging the blessings of peace, would expose the Eastern empire to the danger of an hostile invasion. The Barbarians, who had passed the Danube, had lately assumed the character of soldiers and subjects, but their native fierceness was yet untamed; and the operations of a war which would exercise their valour and diminish their numbers might tend to relieve the provinces from an intolerable oppression. Notwithstanding these specious and solid reasons, which were approved by a majority of the council, Theodosius still hesitated whether he should draw the sword in a contest which could no longer admit any terms of reconciliation; and his magnanimous character was not disgraced by the apprehensions which he felt for the safety of his infant sons and the welfare of his exhausted people. In this moment of anxious doubt, while the fate of the Roman world depended on the resolution of a single man, the charms of the princess Galla most powerfully pleaded the cause of her brother Valentinian. Ref. 078 The heart of Theodosius was softened by the tears of beauty; his affections were insensibly engaged by the graces of youth and innocence; the art of Justina managed and directed the impulse of passion; and the celebration of the royal nuptials was the assurance and signal of the civil war. The unfeeling critics, who consider every amorous weakness as an indelible stain on the memory