Chapter 10 of 68Chapter X: Emperors Decius, Gallus, Æmilianus, Valerian Anderian And Gallienus—Part I. The Emperors Decius, Gallus, Æmilianus, Valerian, And Gallienus.—The General Irruption Of The Barbari Ans.—The Thirty Tyrants. Chapter X: Emperors Decius, Gallus, Æmilianus, Valerian And erian And Gallienus.—Part II. Chapter X: Emperors Decius, Gallus, Æmilianus, Valerian And erian And Gallienus.—Part III. Chapter X: Emperors Decius, Gallus, Æmilianus, Valerian And erian And Gallienus.—Part IV.