"The Romans," writes Dr Hamilton, "were probably the original introducers of this cat, and as the final evacuation of Britain by that nation took place under the emperor Valentinian about A.D.
His complete success, which resulted in the destruction of Maximus and his sons and the pacification of Gaul, led Theodosius to appoint him chief minister for his young brother-in-law Valentinian II.
His rule was most energetic; but while he favoured the barbarians in the imperial service, and appointed them to high office, Valentinian, openly jealous of his minister, sought to surround himself with Romans.
As an offset to this, Arbogast allied himself with the pagan element in Rome, while Valentinian was strictly orthodox.
In 392 Valentinian was secretly put to death at Vienne (in Gaul), and Arbogast, naming as his successor Eugenius, a rhetorician, descended into Italy to meet the expedition which Theodosius was heading against him.