The reign of Heraclius is one of the most remarkable epochs, both in the history of the empire and in the annals of mankind. It warded off the almost inevitable destruction of the Roman government for another century; it laid the foundation of that policy which prolonged the existence of the imperial power at Constantinople under a new modification, as the Byzantine monarchy; and it was contemporary with the commencement of the great moral change in the condition of the people which transformed the language and manners of the ancient world into those of modern nations. The Eastern Empire was indebted to the talents of Heraclius for its escape from those ages of barbarism which, for many centuries, prevailed in all western Europe. No period of society could offer a field for instructive study more likely to present practical results to the highly civilised political communities of modern Europe; yet there is no time of which the existing memorials of the constitution and frame of society are so imperfect and unsatisfactory.

It was perhaps a misfortune for mankind that Heraclius was by birth a Roman rather than a Greek, as his views were from that accident directed to the maintenance of the imperial dominion, without any reference to the national organisation of his people. His civilisation, like that of a large portion of the ruling class in the Eastern Empire, was too far removed from the state of ignorance into which the mass of the population had fallen, for the one to be influenced by the feelings of the other, or for both to act together with the energy conferred by unity of purpose in a variety of ranks. Heraclius, being by birth and family connections an African noble, must have regarded himself as of pure Roman blood, superior to all national prejudices, and bound by duty and policy to repress the domineering spirit of the Greek aristocracy in the state, and of the Greek hierarchy in the church.

Language and manners began to give to national feelings almost as much power in forming men into distinct societies as political arrangements. The influence of the clergy followed the divisions established by language, rather than the political organisation adopted by the government: and as the clergy now formed the most popular and the ablest portion of society, the church exerted more influence over the minds of the people than the civil administration and the imperial power, even though the emperor was the acknowledged sovereign and master of the patriarchs and the pope.

It is necessary to observe here, that the established church of the empire had ceased to be the universal Christian church. The Greeks had rendered themselves the depositaries of its power and influence; they had already corrupted Christianity into the Greek church; and other nations were rapidly forming separate ecclesiastical societies to supply their own spiritual wants. The Armenians, Syrians, and Egyptians were induced by national aversion to the ecclesiastical tyranny of the Greeks, as well as by spiritual preference of the doctrines of Nestorius and Eutyches, to oppose the established church. At the time Heraclius ascended the throne, these national and religious feelings already exercised their power of modifying the operations of the Roman government, and of enabling mankind to advance one step towards the establishment of individual liberty and intellectual independence.

In order fully to comprehend the lamentable state of weakness to which the empire was reduced, it will be necessary to take a cursory view of the condition of the different provinces. The continual ravages of the barbarians who occupied the country beyond the Danube had extended as far as the southern shores of the Peloponnesus. The agricultural population was almost exterminated, except where it was protected by the immediate vicinity of fortified towns, or secured by the fastnesses of the mountains. The inhabitants of all the countries between the Archipelago and the Adriatic had been greatly diminished, and fertile provinces remained everywhere desolate, ready to receive new occupants. As great part of these countries yielded very little revenue to the government, they were considered by the court of Constantinople as of hardly any value, except in so far as they covered the capital from hostile attacks, or commanded the commercial routes to the west of Europe. At this time the Indian and Chinese trade had in part been forced round the north of the Caspian Sea, in consequence of the Persian conquests in Syria and Egypt, and the disturbed state of the country immediately to the east of Persia. The rich produce transported by the caravans, which reached the northern shores of the Black Sea, was then transported to Constantinople, and from thence distributed through western Europe.

Under these circumstances, Thessalonica and Dyrrhachium became points of great consequence to the empire, and were successfully defended by the emperor amidst all his calamities. These two cities commanded the extremities of the usual road between Constantinople and Ravenna, and connected the towns on the Archipelago with the Adriatic and with Rome. The open country was abandoned to the Avars and Slavonians, who were allowed to effect permanent settlements even to the south of the Via Egnatia; but none of these settlements were suffered to interfere with the lines of communication, without which the imperial influence in Italy would have been soon annihilated, and the trade of the West lost to the Greeks. The ambition of the barbarians was inclined to dare any attempt to encroach on the wealth of the Eastern Empire, and they tried to establish a system of maritime depredations in the Archipelago; but Heraclius was able to frustrate their schemes, though it is probable that he owed his success more to the exertions of the mercantile population of the Greek cities than to the exploits of his own troops.

National distinctions and religious interests tended to divide the population, and to balance political power, much more in Italy than in the other countries of Europe. The influence of the church in protecting the people, the weakness of the Lombard sovereigns, from the small numerical strength of the Lombard population, and the oppressive fiscal government of the Roman exarchs, gave the Italians the means of creating a national existence, amidst the conflicts of their masters. Yet so imperfect was the unity of interests, or so great were the difficulties of communication between the people of various parts of Italy, that the imperial authority not only defended its own dominions with success against foreign enemies, but also repressed with ease the ambitious or patriotic attempts of the popes to acquire political power, and punished equally the seditions of the people and the rebellions of the chiefs, who, like Joannes Compsa of Neapolis and the exarch Eleutherinus, aspired at independence.

Africa alone, of all the provinces of the empire, continued to use the Latin language in ordinary life; and its inhabitants regarded themselves, with some reason, as the purest descendants of the Romans. After the victories of Johannes the Patrician, it had enjoyed a long period of tranquillity, and its prosperity was undisturbed by any spirit of nationality adverse to the supremacy of the empire, or by schismatic opinions hostile to the church. The barbarous tribes to the south were feeble enemies, and no foreign state possessed a naval force capable of troubling its repose or interrupting its commerce. Under the able and fortunate administration of Heraclius and Gregoras, the father and uncle of the emperor, Africa formed the most flourishing portion of the empire. Its prosperous condition, and the wars raging in other countries, threw great part of the commerce of the Mediterranean into the hands of the Africans. Wealth and population increased to such a degree that the naval expedition of the emperor Heraclius, and the army of his cousin Nicetas, were fitted out from the resources of Africa alone. Another strong proof of the prosperity of the province, of its importance to the empire, and of its attachment to the interests of the Heraclian family is afforded by the resolution which the emperor adopted, in the ninth year of his reign, of transferring the imperial residence from Constantinople to Carthage.

In Constantinople an immense body of idle inhabitants had been collected, a mass that had long formed a burden on the state, and acquired a right to a portion of its resources. A numerous nobility, and a permanent imperial household, conceived that they formed a portion of the Roman government from the prominent part which they acted in the ceremonial that connected the emperor with the people. Thus, the great natural advantages of the geographical position of the capital were neutralised by moral and political causes; while the desolate state of the European provinces, and the vicinity of the northern frontier, began to expose it to frequent sieges. As a fortress and place of arms, it might still have formed the bulwark of the empire in Europe; but while it remained the capital, its immense unproductive population required that too large a part of the resources of the state should be devoted to supplying it with provisions, to guarding against the factions and the seditions of its populace, and to maintaining in it a powerful garrison. The luxury of the Roman court had, during ages of unbounded wealth and unlimited power, assembled round the emperor an infinity of courtly offices, and caused an enormous expenditure, which it was extremely dangerous to suppress and impossible to continue.