As soon as it was known that the armies of the East, Dalmatia and Illyricum had declared for Vespasian, Vitellius, deserted by many of his adherents, would have resigned the title of emperor.
In 49 he was legate of Caesar and, with P. Cornelius Dolabella, was entrusted with the defence of Illyricum against the Pompeians.
Farlatus and others, Illyricum Sacrum (Venice, 1751-1819); C. du Fresne du Cange, Illyricum vetus et novum (1746); M.
In 39 6 he fought in Greece against the Visigoths, but an arrangement was effected whereby their chieftain Alaric was appointed master of the soldiery in Illyricum (397).
They made Milan their home; and the empire was nominally divided between them, Gratian taking the trans-Alpine provinces, whilst Italy, Illyricum in part, and Africa were to be under the rule of Valentinian, or rather of his mother, Justina.
The ministers of Arcadius desired to annex Dalmatia to his portion, while the general Stilicho, who was supreme in the west, wished to wrest from the eastern realm the prefecture of Illyricum or a considerable part of it.