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Attila (/ ə ˈ t ɪ l ə / ə- TIL -ə or / ˈ æ t ɪ l ə / AT -il-ə; fl. c. 406–453), frequently called Attila the Hun, was the ruler of the Huns from 434 until his death, in early 453. He was also the leader of an empire consisting of Huns, Ostrogoths, Alans, and Gepids, among others, in Central and Eastern Europe.

As nephews to Rugila, Attila and his elder brother Bleda succeeded him to the throne in 435, ruling jointly until the death of Bleda in 445. During his reign, Attila was one of the most feared enemies of the Western and Eastern Roman Empires. He crossed the Danube twice and plundered the Balkans but was unable to take Constantinople. In 441, he led an invasion of the Eastern Roman (Byzantine) Empire, the success of which emboldened him to invade the West. He also attempted to conquer Roman Gaul (modern France), crossing the Rhine in 451 and marching as far as Aurelianum (Orléans), before being stopped in the Battle of the Catalaunian Plains.

He subsequently invaded Italy, devastating the northern provinces, but was unable to take Rome. He planned for further campaigns against the Romans but died in 453. After Attila's death, his close adviser, Ardaric of the Gepids, led a Germanic revolt against Hunnic rule, after which the Hunnic Empire quickly collapsed. Attila lived on as a character in Germanic heroic legend.