Huns in Europe 
The Huns appeared in Europe in the 4th century, apparently from in Central Asia. They first appeared north of the Black Sea, forcing a large number of Goths to seek refuge in the Roman Empire; later, the Huns appeared west of the Carpathians in Pannonia, probably sometime between 400 and 410, perhaps triggering the massive migration of Germanic tribes westward across the Rhine in December 406.
The establishment of the 5th century Hunnic Empire marks a historically early instance of horseback migration. Under the leadership of Attila the Hun, the Huns achieved hegemony over several well-organized rivals by using superior weaponry such as the Hun bow, and a well-organized system of taxation. Supplementing their wealth by plundering wealthy Roman cities to the south, the Huns maintained the loyalties of a diverse number of tributary tribes.
Attila's Huns incorporated groups of unrelated tributary peoples. In Europe, Alans, Gepids, Scirii, Rugians, Sarmatians, Slavs and Gothic tribes all united under the Hun family military elite. After Attila's death, some of his Huns eventually settled in Pannonia, but the Empire dissolved after his sons were defeated by Ardaric's coalition at the Battle of Nedao in 454, at modern day Nedava.
Memory of the Hunnish conquest was transmitted orally among Germanic peoples and is an important component in the Old Norse Völsunga saga and Hervarar saga, and the Middle High German Nibelungenlied, all of which portray Migrations period events a millennium before their written recordings. In the Hervarar saga, the Goths make first contact with the bow-wielding Huns and meet them in an epic battle on the plains of the Danube. In the Völsunga saga and the Nibelungenlied, Attila (Atli in Norse and Etzel in German) defeats the Frankish king Sigebert I (Sigurðr or Siegfried) and the Burgundian King Guntram (Gunnar or Gunther), but is later assassinated by Queen Fredegund (Gudrun or Kriemhild), the sister of the latter and wife of the former.
