18 THE EARLY MIDDLE AGES
fighting in the forests and plains beyond the Roman frontier; contact between them
and Rome went back at least to the second century b.c., and during the age of the
Pax Romana a fragile peace characterized their relations. Occasional raiding ex-
peditions moved back and forth across the Rhine-Danube border, but with one or
two exceptions no full-scale conflicts broke out. By the third century a.d., however,
conditions had changed dramatically. The Germanic population had grown to such
an extent that the various tribes began to fight bitterly between themselves for
control of nomadic routes and patches of cultivated land. These clashes often led
to vendettas between clans that propelled the violence into generation after gen-
eration. In order to survive, the Germans had to find more land for themselves;
but expansion to the east was impossible, since new nomadic groups emerging
from the Eurasian steppe increasingly competed for the same land. The only al-
ternative was to move westward and southward into Roman territory.
By far the most aggressive of the Germans was a group known as the Goths,
who crossed the lower Danube and moved into Dacia, the site of the extensive
gold and mineral deposits conquered by Trajan in the early second century. In
order to defend Dacia and to counterattack the Sassanids, the empire transferred
several legions from the Rhine region, which allowed other Germanic groups like
the Alemanni (the word means “all men” and suggests a confederation of several
tribes rather than a single ethnic group) and the Franks to cross the border there
and move into northern and central Gaul. In order to slow the flood of in-comers,
Rome began to conscript Germanic soldiers as federati—that is, as semi-Romanized
recruits who represented the first line of defense against the onslaught.
Indeed, the federati characterize much of what was happening within the
Roman army at that time. The army no longer served as an instrument of Ro-
manization. Instead, it sought recruits on the local scene, whether it was northern
Gaul or northern Mesopotamia, and tried to entice them into immediate service
on the spot with promises of higher wages than they could hope for in any other
occupation. It became an army of mercenaries rather than an implement of social
organization. Discipline broke down, and with it went the sense of identifying
with an ideal larger than personal or tribal well-being. Consequently, the soldiery
recognized their importance to whomever was on the throne, and began to insist
upon ever higher salaries and more frequent donatives (gifts from the state). Po-
litical power became overtly military in nature: Whoever could command the loy-
alty of the greatest number of troops was likely to attain the imperial office. To
hold onto his throne, for example, Caracalla (211–217) not only increased the size
of the army dramatically but he also raised the soldiers’ salaries by nearly fifty
percent. This raise set off a virtual bargaining war between generals aspiring to
imperial glory, and explains the high turnover of the imperial office throughout
the third century.
Military setbacks, combined with the harsh new taxes needed to pay for mer-
cenaries and the unfortunate double blow of an outbreak of plague and a series
of earthquakes in the 250s and 260s, dealt a severe blow to the Roman economy.
Actions like Caracalla’s set off a crushing wave of inflation that continued through-
out the century. Merchants and financiers found it unwise, if not impossible, to
invest over the long term or in new manufactures, and matters worsened when
several short-lived emperors attempted to cover their military expenditures by
debasing the coinage. As civil warfare, Germanic invasion, economic hardship,
and plague carried off more and more people, the tax base gradually eroded,
which made the curiales, who had embodied the public-spiritedness of Rome in
its heyday, flee their obligations and their cities, thus depriving society of its lead-