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Hun
member of a nomadic pastoralist people who invaded southeastern Europe c. AD 370 and during the next seven decades built up an enormous empire there and in central Europe. Appearing from beyond the Volga River some years after the middle of the 4th century, they first overran the Alani, who occupied the plains between the Volga and the Don rivers, and then quickly overthrew the empire of the Ostrogoths between the Don and the Dniester. About 376 they defeated the Visigoths living in what is now approximately Romania and thus arrived at the Danubian frontier of the Roman Empire.
The earliest systematic description of the Huns is that given by the historian Ammianus Marcellinus, writing c. 395. They were apparently primitive pastoralists who knew nothing of agriculture. They had no settled homes and no kings; each group was led by primates, as Ammianus called them. Whether or not they had a single overall leader in the 4th century is still a matter of dispute.
As warriors the Huns inspired almost unparalleled fear throughout Europe. They were amazingly accurate mounted archers, and their complete command of horsemanship, their ferocious charges and unpredictable retreats, and the speed of their strategical movements brought them overwhelming victories.
For half a century after the overthrow of the Visigoths, the Huns extended their power over many of the Germanic peoples of central Europe and fought for the Romans. By 432 the leadership of the various groups of Huns had been centralized under a single king, Rua, or Rugila. When Rua died in 434 he was succeeded by his two nephews, Bleda and Attila. The joint rulers negotiated a peace treaty at Margus (Pozarevac) with the Eastern Roman Empire, by which the Romans agreed to double the subsidies they had been paying the Huns. The Romans apparently did not pay the sums stipulated in the treaty, and in 441 Attila launched a heavy assault on the Roman Danubian frontier, advancing almost to Constantinople.
edit source: Encyclopædia Britannica