Valentinian III was Roman emperor of the West, from 425 to 455. He was born in 419 and died in 455. Son of Constantius and Placidia, daughter of Theodosius, he succeeded Honorius, his mother acting as regent. The Vandals, who had conquered Roman Africa and set up a kingdom there, concluded an alliance with Attila, who, after defeat by Aetius near Chalons, invaded northern Italy, while the Vandal fleet ravaged the coasts of Sicily. Aetius was treacherously put to death by Valentinian III who a year later shared the same fate. Research Valentinian III
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