the fourth and fifth centuries was no longer the Roman Empire of the
great Antonine and Augustan age; that it had lost its hold over its
territories and its economic cohesion and was menaced by the barbarians
who were in the end to overwhelm it. The territory of the Roman Empire
had at its height stretched from the lands bordering the North Sea to
the lands on the northern fringes of the Sahara, and from the Atlantic
coast of Europe to the central Asiatic Steppes; it comprised most of the
regions of the former Hellenic, Iranian, and Phoenician empires, and it
either ruled or kept in check great clusters of peoples and
principalities beyond its Gallic and north African frontiers. From these
farthest frontiers Rome of the fourth century had retreated and was
still retreating.

Within its frontiers great currents of inter-regional commerce had in
earlier centuries flowed along the routes which bound all the provinces
of the Empire to Rome and most of the provinces to each other. But from
the third century onwards the economic unity of the Empire was in
dissolution, and by the fifth century most of the great currents of
inter-regional trade had ceased to flow, and provinces and districts had
been thrown upon themselves and their own resources. And with the wealth
of the provinces reduced, their commerce restricted, the great
provincial cities also declined in population, wealth, political power.

Yet to its very last days the Empire endeavoured to defend its frontiers
against the converging barbarians. Not only did the Barbarian Conquests,
like all conquests, threaten destruction and ruin, but the way of life
the barbarians stood for was the very denial of what Roman civilization
had been, though alas, was gradually ceasing to be.

However, it was not in material things, that the contemporaries found,