+3.+ My History begins in the 140th Olympiad. The events from which it starts are these. In Greece, what is called the Social war: the first waged by Philip, son of Demetrius and father of Perseus, in league with the Achaeans against the Aetolians. In Asia, the war for the possession of Coele-Syria which Antiochus and Ptolemy Philopator carried on against each other. In Italy, Libya, and their neighbourhood, the conflict between Rome and Carthage, generally called the Hannibalian war. My work thus begins where that of Aratus of Sicyon leaves off. Now up to this time the world’s history had been, so to speak, a series of disconnected transactions, as widely separated in their origin and results as in their localities. But from this time forth History becomes a connected whole: the affairs of Italy and Libya are involved with those of Asia and Greece, and the tendency of all is to unity. This is why I have fixed upon this era as the starting-point of my work. For it was their victory over the Carthaginians in this war, and their conviction that thereby the most difficult and most essential step towards universal empire had been taken, which encouraged the Romans for the first time to stretch out their hands upon the rest, and to cross with an army into Greece and Asia. [Sidenote: A sketch of their previous history necessary to explain the success of the Romans.] Now, had the states that were rivals for universal empire been familiarly known to us, no reference perhaps to their previous history would have been necessary, to show the purpose and the forces with which they approached an undertaking of this nature and magnitude. But the fact is that the majority of the Greeks have no knowledge of the previous constitution, power, or achievements either of Rome or Carthage. I therefore concluded that it was necessary to prefix this and the next book to my History. I was anxious that no one, when fairly embarked upon my actual narrative, should feel at a loss, and have to ask what were the designs entertained by the Romans, or the forces and means at their disposal, that they entered upon those undertakings, which did in fact lead to their becoming masters of land and sea everywhere in our part of the world. I wished, on the contrary, that these books of mine, and the prefatory sketch which they contained, might make it clear that the resources they started with justified their original idea, and sufficiently explained their final success in grasping universal empire and dominion. [Sidenote: The need of a comprehensive view of history as well as a close study of an epoch.]