The date from which I propose to begin my history is the 140th Olympiad [220–216 BC], and the events are the following: (1) in Greece the so‑called Social War, the first waged against the Aetolians by the Achaeans in league with and under the leadership of Philip of Macedon, the son of Demetrius and father of Perseus, (2) in Asia the war for Coele-Syria between Antiochus and Ptolemy Philopator, (3) in Italy, Libya, and the adjacent regions, the war between Rome and Carthage, usually known as the Hannibalic War. These events immediately succeed those related at the end of the work of Aratus of Sicyon. Previously the doings of the world had been, so to say, dispersed, as they were held together by no unity of initiative, results, or locality; but ever since this date history has been an organic whole, and the affairs of Italy and Libya have been interlinked with those of Greece and Asia, all leading up to one end. And this is my reason for beginning where I do.
— POLYBIUS