Ostrogoths

Ostrogothic helmet
By 476 AD, the Roman
Emperors no longer had any practical power in the West. In that
year, the last Roman Emperor in the West, Romulus Augustulus, was deposed,
and a Hun named Odoacer took charge of what was
left of the Western Empire (mainly Italy). Odoacer sent a message to
the Roman Emperor in the East, Zeno,
telling him that it was no longer necessary to have a Western emperor,
thank you very much.
Zeno was not totally happy with this arrangement, and wanted to take
back control of Italy. But he had no Roman troops free to go to Italy;
they were all needed to defend Constantinople from the Sassanids.
So Zeno sent the Arian
Ostrogoths, under their king Theodoric, to take Italy back from Odoacer.
The Ostrogoths soon did get rid of Odoacer (and kill him), and then
Theodoric effectively became king of Italy, although unlike Odoacer
Theodoric was smart enough not to tell Zeno that!
Officially, Theodoric was Zeno's representative in Italy. But he did
what he liked.

