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

Chapter XXV: Reigns Of Jovian And Valentinian, Division Of The Empire

The Government And Death Of Jovian.—Election Of Valentinian, Who Associates His Brother Valens, And Makes The Final Division Of The Eastern And Western Empires.— Revolt Of Procopius.—Civil And Ecclesiastical Administration.—Germany.—Britain.—Africa.—The East.— The Danube.—Death Of Valentinian.—His Two Sons, Gratian And Valentinian II., Succeed To The Western Empire.