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In 434, Attila and his brother Bleda negotiated a treaty with the East Roman (Byzantine) emperor Theodosius II and obtained an immense annual tribute of about 300 kg (660 lb) of gold.
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He murdered Bleda in 445 and assumed sole power over the warlike Huns, with an empire that stretched from the Rhine River to the Baltic and Caspian seas.
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Turning westward with a huge army that included thousands of German vassals,
His purpose was to plunder the crumbling Western Roman Empire. Roman armies from Gaul led by the Roman general Flavius Aëtius and Visigoths under Theodoric I joined forces against the common threat. At the Battle of Chalons (near Troyes), Attila suffered heavy losses, and he withdrew across the Rhine -