I must inform you that the Grecian method of dating time was by _Olympiads_; that is, four complete years; so called from the celebration, every fifty years, of the Olympic Games, which were contests in all the manly exercises, such as wrestling, boxing, running, chariot-racing, &c. They were instituted in honour of Jupiter and took their name from Olympia, a city of Elis, near which they were performed: they were attended by all ranks of people, from every state in Greece; the noblest youths were eager to obtain the prize of victory, which was no other than an olive crown, but esteemed the most distinguishing ornament. These games continued all the time that Greece retained any spark of liberty; and with them begins the authentic history of that country--all before being considered as fabulous. You must therefore endeavour to remember, that they began in the year of the world 3228; after the flood 1570 years; after the destruction of Troy 400; before the building of Rome 23; before Cyrus about 200; and 770 before Christ. If you cannot retain _all_ these dates, at least you must not fail to remember the near coincidence of the first _Olympiad_ with the _building of Rome_, which is of great consequence, because, as the Grecians reckoned time by Olympiads, the Romans dated from the building of their city; and as these two eras are within 23 years of each other, you may, for the ease of memory, suppose them to begin together, in the year of the world 3228. In reading the history of the _Roman Republic_, which continued in that form of government to the time of Julius Caesar's dictatorship, about the year of the world 3960, and about 48 years before Christ, you will make as many epochas as you shall find convenient: I will mention only two; the sacking of Rome by the Gauls, which happened in the year of the world 3620, in the 365th year of the city, in the 97th Olympiad, before Christ 385, and about 30 years before the birth of Alexander. The second epocha may be the 608th year of the city, when, after three obstinate wars, Carthage was destroyed, and Rome was left without a rival. Perhaps the following bad verses, which were given me when I was young, may help to fix in your mind the important eras of the Roman and Grecian dates: You must not laugh at them, for chronologers do not pique themselves on their poetry, but they make use of numbers and rhymes merely as assistants to memory, being so easily learned by heart. "Rome and Olympiads bear the same date, Three thousand two hundred and twenty-eight. In three hundred and sixty[29] was Rome sack'd and torn, Thirty summers before Alexander was born."