P Licinius Gallienus was a Roman emperor, associated with his father Valerianus until the capture of the latter by the Persians in 260, when Gallienus continued to reign alone. His empire was limited by the revolt of most of the legions in the provinces, who chose their commanders as Caesars, and thus gave rise to the period known as the 'Time of the Thirty Tyrants.' Though given up to pleasure, he defeated the Goths in Thrace and Postumus in Gaul, and forced Aureolus, whom the legions of Illyria had proclaimed emperor, to take refuge in Milan. While making preparations to reduce that town he himself was assassinated in 268 AD. Research Gallienus
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