Attila ruled from 433 until his death in 453. Orginally his brother Bleda ruled half the tribe and Atilla the other, until Bleda's death in 447 when Atilla became the sole King.
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Attila was known as Flagellum Dei by the Romans (Scourge of God). He spent much of his reign waging war across Europe, burning and pillaging in his wake. His actions are partially behind the fall of the Roman Empire. At its height Attila's empire stretched from the Ural river to the Rhine.
However it's Attila's death which is of interest today.