He loved glory, as the reward, perhaps even as the motive, of his labours. The boundless ambition which, from the moment of his accepting the purple at York, appears as the ruling passion of his soul, may be justified by the dangers of his own situation, by the character of his rivals, by the consciousness of superior merit, and by the prospect that his success would enable him to restore peace and order to the distracted empire. In his civil wars against Maxentius and Licinius, he had engaged on his side the inclinations of the people, who compared the undissembled vices of those tyrants with the spirit of wisdom and justice which seemed to direct the general tenor of the administration of Constantine.
Had Constantine fallen on the banks of the Tiber, or even in the plains of Hadrianopolis, such is the character which, with few exceptions, he might have transmitted to posterity. But the conclusion of his reign (according to the moderate and indeed tender sentence of a writer of the same age) degraded him from the rank which he had acquired among the most deserving of the Roman princes. In the life of Augustus, we behold the tyrant of the republic converted, almost by imperceptible degrees, into the father of his country and of human kind. In that of Constantine we may contemplate a hero who had so long inspired his subjects with love and his enemies with terror degenerating into a cruel and dissolute monarch, corrupted by his fortune, or raised by conquest above the necessity of dissimulation. The general peace which he maintained during the last fourteen years of his reign was a period of apparent splendour rather than of real prosperity; and the old age of Constantine was disgraced by the opposite yet reconcilable vices of rapaciousness and prodigality. The accumulated treasures found in the palaces of Maxentius and Licinius were lavishly consumed; the various innovations introduced by the conqueror were attended with an increasing expense; the cost of his buildings, his court, and his festivals required an immediate and plentiful supply; and the oppression of the people was the only fund which could support the magnificence of the sovereign. His unworthy favourites, enriched by the boundless liberality of their master, usurped with impunity the privilege of rapine and corruption.
A secret but universal decay was felt in every part of the public administration; the emperor himself, though he still retained the obedience, gradually lost the esteem of his subjects. The dress and manners which, towards the decline of life, he chose to affect, served only to degrade him in the eyes of mankind. The Asiatic pomp, which had been adopted by the pride of Diocletian, assumed an air of softness and effeminacy in the person of Constantine. He is represented with false hair of various colours, laboriously arranged by the skilful artists of the times; a diadem of a new and more expensive fashion; a profusion of gems and pearls, of collars and bracelets, and a variegated flowing robe of silk, most curiously embroidered with flowers of gold. In such apparel, scarcely to be excused by the youth and folly of Elagabalus, we are at a loss to discover the wisdom of an aged monarch and the simplicity of a Roman veteran. A mind thus relaxed by prosperity and indulgence was incapable of rising to that magnanimity which disdains suspicion and dares to forgive. The deaths of Maximian and Licinius may perhaps be justified by the maxims of policy as they are taught in the schools of tyrants; but an impartial narrative of the executions, or rather murders, which sullied the declining age of Constantine, will suggest to our most candid thoughts the idea of a prince who could sacrifice without reluctance the laws of justice and the feelings of nature to the dictates either of his passions or of his interest.