Valentinian was the son of Count Gratian, who was a native of Cibalis in Pannonia, and who, from an obscure condition, had raised himself, by matchless strength and dexterity, to the military commands of Africa and Britain; from which he retired with an ample fortune and suspicious integrity. The rank and services of Gratian contributed, however, to smooth the first steps of the promotion of his son, and afforded him an early opportunity of displaying those solid and useful qualifications, which raised his character above the ordinary level of his fellow-soldiers.
The person of Valentinian was tall, graceful, and majestic. His manly countenance, marked with the impressions of sense and spirit, inspired his friends with awe, and his enemies with fear; and, to second the efforts of his undaunted courage, the son of Gratian had inherited the advantages of a strong and healthy constitution. By the habits of chastity and temperance, which restrain the appetites and invigorate the faculties, Valentinian preserved his own and the public esteem. The avocations of a military life had diverted his youth from the elegant pursuits of literature; he was ignorant of the Greek language, and the arts of rhetoric; but as the mind of the orator was never disconcerted by timid perplexity, he was able, as often as the occasion prompted him, to deliver his decided sentiments with bold and ready elocution. The laws of martial discipline were the only laws that he had studied; and he was soon distinguished by the laborious diligence and inflexible severity with which he discharged and enforced the duties of the camp. In the time of Julian he provoked the danger of disgrace by the contempt which he publicly expressed for the reigning religion; and it should seem from his subsequent conduct that the indiscreet and unseasonable freedom of Valentinian was the effect of military spirit, rather than of Christian zeal. He was pardoned, however, and still employed by a prince who esteemed his merit; and in the various events of the Persian War, he improved the reputation which he had already acquired on the banks of the Rhine. The celerity and success with which he executed an important commission recommended him to the favour of Jovian, and to the honourable command of the second school, or company, of targeteers, of the domestic guards. In the march from Antioch, he had reached his quarters at Ancyra, when he was unexpectedly summoned, without guilt, and without intrigue, to assume, in the forty-third year of his age, the absolute government of the Roman Empire.
The invitation of the ministers and generals at Nicæa was of little moment, unless it were confirmed by the voice of the army. The aged Sallust, who had long observed the irregular fluctuations of popular assemblies, proposed, under pain of death, that none of those persons, whose rank in the service might excite a party in their favour, should appear in public on the day of the inauguration. Yet such was the prevalence of ancient superstition, that a whole day was voluntarily added to this dangerous interval, because it happened to be the intercalation of the bissextile. At length, when the hour was supposed to be propitious, Valentinian showed himself from a lofty tribunal; the judicious choice was applauded; and the new prince solemnly invested with the diadem and the purple amidst the acclamations of the troops, who were disposed in martial order round the tribunal. But when he stretched forth his hand to address the armed multitude, a busy whisper was accidentally started in the ranks, and insensibly swelled into a loud and imperious clamour, that he should name, without delay, a colleague in the empire.
The intrepid calmness of Valentinian at last obtained silence, and commanded respect; and he thus addressed the assembly: “A few minutes since it was in your power, fellow-soldiers, to have left me in the obscurity of a private station. Judging, from the testimony of my past life, that I deserved to reign, you have placed me on the throne. It is now my duty to consult the safety and interest of the republic. The weight of the universe is undoubtedly too great for the hands of a feeble mortal. I am conscious of the limits of my abilities, and the uncertainty of my life; and far from declining, I am anxious to solicit, the assistance of a worthy colleague. But, where discord may be fatal, the choice of a faithful friend requires mature and serious deliberation. That deliberation shall be my care. Let your conduct be dutiful and consistent. Retire to your quarters, refresh your minds and bodies; and expect the accustomed donative on the accession of the new emperor.”