Pliny, who is so rich in valuable information on the agricultural and social advances of Italy, tells us that it opened its hills and plains to the triumphal entrance of Dionysus between 130 and 120 B.C., about the time that Rome entered into possession of the kingdom of Pergamus, the largest and richest part of Asia Minor, left to it by bequest of Attalus. Thenceforward, for a century and a half, the progress of grape-growing continued without interruption; every generation poured forth new capital to enlarge the inheritance of vineyards already grown and to plant new ones. As the crop increased, the effort was redoubled to widen the sale, to entice a greater number of people to drink, to put the Italian wines by the side of the Greek.
At the distance of centuries, these vine-growing interests do not appear even in history; but they actually were a most important factor in the Roman policy, a force that helps us explain several main facts in the history of Rome. For example, vineyards were one of the foundations of the imperial authority in Italy. That political form which was called with Augustus the principality, and from which was evolved the monarchy, would not have been founded if in the last century of the Republic all Italy had not been covered with vineyards and olive orchards. The affirmation, put just so, may seem strange and paradoxical, but the truth of it will be easy to prove.
The imperial authority was gradually consolidated, because, beginning with Augustus, it succeeded in pacifying Italy after a century of commotion and civil wars and of foreign invasions, to which the secular institutions of the Republic had not known how to oppose sufficient defence; so that, little by little, right or wrong, the authority of the Princeps, as supreme magistrate, and the power of the Julian-Claudian house, which the supreme magistrate had organised, seemed to the Italian multitude the stable foundation of peace and order. But why was Italy, beginning with the time of Caesar, so desperately anxious for peace and order? It would be a mistake to see in this anxiety only the natural desire of a nation, worn by anarchy, for the conditions necessary to a common social existence. The contrast of two episodes will show you that during the age of Caesar annoyance at disorder and intolerance of it had for a special reason increased in Italy. Toward the end of the third century B.C., Italy had borne on its soil for about seventeen years the presence of an army that went sacking and burning everywhere—the army of Hannibal—without losing composure, awaiting with patience the hour for torment to cease. A century and a half later, a Thracian slave, escaping from the chain-gang with some companions, overran the country,—and Italy was frightened, implored help, stretched out its arms to Rome more despairingly than it had ever done in all the years of Hannibal.