The actual term barbar seems to have arisen from Greek mimicry of unfamiliar language, i.e. 'bar-bar', rather as we say 'jabber-jabber'. The Latin barbatus (bearded) appears to describe a barbarian characteristic rather than to supply the expression. Though the name was applied to nations outside the classical orbit, not all the empire's neighbors were considered barbarians. Apart from Bedouin, the Near and Middle Eastern races were seldom so described.
Literary usage suggests that 'barbarian' meant what it does today: the opposite to civilized; and that barbarians were seen as backward, wayward and dangerous. In practice, the barbarians with whom Rome had contact were largely European, though these extended indefinitely eastwards into northern Asia. In North Africa the surviving word 'Berber' implies that the interior tribes were also called by this name.
However, these were fewer and further from mainstream events, as demonstrated by the guarding of North Africa (other than Egypt) by a single legion, in contrast to Europe's fourteen. (McNeill, 1992) To concentrate on the three ethnic groups confronting the empire in Europe is to focus on the barbarians about whom most is known, whose importance for history is greatest and who offer the widest spectrum of development: from the creative Celts, on the verge of literacy, to the still nomadic Sarmatians, gruesome in their savagery.
In Egypt the barbarian problem would easily be solved by barring the Nile at its first cataract, while the Eastern and Western Deserts largely looked after themselves. In the remainder of North Africa the barrier of the Sahara shielded the Roman provinces from invasion, though nomadism on its fringes was a source of nuisance, as it was along the Syrian and Arabian frontiers. In the East, however, stability hinged on a single factor: the longstanding rivalry between Rome and Parthia, each coveting the........