The History of the Decline and Fall of the Roman Empire, by Edward Gibbon

Chapter XXVII: Civil Wars, Reign Of Theodosius

Death Of Gratian.—Ruin Of Arianism.—St. Ambrose.—First Civil War, Against Maximus.—Character, Administration, And Penance Of Theodosius.—Death Of Valentinian II.—Second Civil War, Against Eugenius.—Death Of Theodosius.