From The Gates of Europe: A History of Ukraine, by Serhii Plokhy (Basic Books, 2017), Kindle pp. 43-45:
THE SLAVS FIRST came to general attention in the early sixth century AD, when they showed up en masse on the borders of the Byzantine Empire, which had been weakened by the Goths and Huns, and moved into the Balkans. Jordanes, a sixth-century Byzantine author of Gothic descent, distinguished two major groups among the Slavs of his day. “Though their names are now dispersed amid various clans and places,” he wrote, “yet they are chiefly called Sclaveni and Antes.” He placed the Sclaveni between the Danube and the Dniester, reserving for the Antes the lands between the Dniester and the Dnieper, “in the curve of the sea of Pontus.” Linguistic data suggests that the ancestral homeland of the Slavs lay in the forests and forest-steppe zone between the Dnieper and the Vistula, mainly in Volhynia and the Prypiat marshes of today’s Ukraine. By the time Jordanes wrote, the Slavs must have moved from their forest recesses into the steppes, creating a serious problem for Emperor Justinian the Great.
Justinian ruled the Byzantine Empire between 527 and 567 and was ambitious enough to attempt a restoration of the Roman Empire in its entirety, both east and west. On the Danube frontier, where the empire faced unceasing attacks from local tribes, Justinian decided to take the offensive. Procopius, a sixth-century Byzantine author who left a detailed account of Justinian’s wars, writes that in the early 530s Chilbudius, a commander personally close to the emperor, was sent to wage war north of the Danube. He scored a number of victories over the Antes, which allowed Justinian to add “Anticus” (conqueror of the Antes) to his imperial title. But the success was short-lived. Three years later Chilbudius was killed in battle, and Justinian returned to the old policy of defending the border along the Danube instead of trying to extend it.
Justinian brought back the old Roman tactic of “divide and rule.” By the end of the 530s, not without Byzantine encouragement and incentives, the Antes were already fighting the Sclaveni, while Byzantine generals recruited both groups into the imperial army. Even so, the Slavic raids continued. While at war with the Sclaveni, the Antes managed to invade the Byzantine province of Thrace in the eastern Balkans. They pillaged the land and took numerous slaves, whom they brought back to the left bank of the Danube. Having manifested their destructive potential, the Antes offered their services to the empire. Justinian took them under his wing and designated the abandoned Greek city of Turris, north of the Danube, as their headquarters.
Like many other enemies of the empire, the Antes became its defenders in exchange for regular payments from the imperial treasury. They tried to enhance their status by claiming to have captured the emperor’s best general, Chilbudius, whom they wanted to recognize as their leader. Since Justinian had granted Chilbudius the title of magister militum, or commander of all the imperial troops in the region, such recognition would have made them legitimate citizens of the empire, not merely its gatekeepers. The plot did not succeed. The true Chilbudius was, of course, long dead, his impostor was captured and sent to Justinian, and the Antes had to accept the status of foederati—allies rather than citizens of the great empire.
Far Outliers 