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Roman Emperor - Valentinian III
Flavius Placidus Valentinian III (grandnephew of Valentinian I) was born 419 A.D. He was Roman emperor in the West from 425 A.D. to 455 A.D.
He was the son of Constantius III, by Placidia, the daughter of Theodosius the Great, and was seated on the throne of the West by Theodosius II, emperor of the East, in 425.
Although Valentinian's mother, Galla Placidia, was regent during his minority, after 433 A.D. the Roman general Aetius wielded greater influence in the West. During Valentinian's rule, Rome lost provinces in northern Africa to the Vandals.
He was a weak prince, who never really ruled during the 30 years that he sat on the imperial throne; his mother, Placidia, governing for him till her death in 450.
In 452 A.D. the Huns under Attila invaded Italy, but they did not march on Rome, partly because of the intercession of Pope Leo I. In 454 A.D., Valentinian killed Aetius, in a fit of envious jealousy, and in the next year was himself slain by Maximus, whose wife he had ravished.
Valentinian was the last of the Theodosian line.