Ostrogoths
Celts, Germans, Visigoths, Ostrogoths, Huns, Vandals, Venetii .......
The western part of the Roman empire was invaded by the Vandals, Alans and Sueves in 406 AD. Later the Ostrogoths took over Italy. The Angles, Saxons, Jutes and Frisians migrated to Rome in waves and took it over. The city of Rome was sacked three times, by the Visigoth, the Vandals and the Ostrogoths.
Germanic tribes and Gauls Vandali, Ostrogothi and Visigothi (or Wisigothi)
Parthians, Carthage, Persia, Visigoths, Ostrogoths, Vandals, Alans, and Huns
The Ostrogoths and the Vandals.
Rome has been sacked by the Visigoths, Vandals, Ostrogoths, and many more.
If you are referring to the city of Rome, as opposed to the Roman Empire, three Germanic peopled sacked Rome. The Visigoths in 410, the Vandals in 455 and the Ostrogoths in 546.
No one sacked Rome in 476 BC. Rome was sacked by the Senone Gauls in 390 BC
Vandals, Burgundians, Goth, Ostrogoths, and Visigoths.
Parthians, Carthage, Persia, Visigoths, Ostrogoths, Vandals, Alans, and Huns. Rome defeated most of these groups, but the Visigoths, Ostrogoths, and Huns (you may have heard of Atilla the Hun) were the groups that contributed to the collapse of the Western Roman Empire.
They were a people from central Eurasia who migrated to western Europe and took over part of the Roman Empire, together with the Ostrogoths, Vandals, Franks etc.