Gates of Gades, when he says that they were the farthest limits at which Hercules arrived.[1287] Dicæarchus, Eratosthenes, and Polybius, with most of the Grecians, represent the Pillars as being close to the strait, while the Iberians and Libyans place them at Gades, alleging that there is nothing at all resembling pillars close by the strait. Others pretend that they are the pillars of brass eight cubits high in the temple of Hercules at Gades, on which is inscribed the cost of erecting that edifice; and that the sailors coming there on the completion of their voyage and sacrificing to Hercules, rendered the place so famous that it came to be regarded as the termination of the land and sea. Posidonius thinks this view the most probable of all, and looks upon the oracle and the several expeditions as a Phœnician invention.[1288] As for the expeditions, what matters it whether any one should vehemently deny or credit the account, as neither the one nor the other would be inconsistent with reason: but the assertion that neither the little islands, nor yet the mountains, bear much resemblance to pillars, and that we should seek for pillars, strictly so called, [set up] either as the termination of the habitable earth, or of the expedition of Hercules, has at all events some reason in it; it being an ancient usage to set up such boundary marks. As for instance the small column which the inhabitants of Rhegium[1289] erected by the Strait of Sicily, which is indeed a little tower; and the tower called after Pelorus, which is situated opposite to this small column; also the structures called altars[1290] of the Philæni, about midway in the land between the Syrtes; likewise it is recorded, that a certain pillar was formerly erected on the Isthmus of Corinth, which the Ionians who took possession of Attica and Megaris when they were driven out of the Peloponnesus, and those who settled in the Peloponnesus, set up in common, and inscribed on the side next Megaris, “This is no longer Peloponnesus, but Ionia;” and on the opposite, “This is Peloponnesus, not Ionia.” Alexander too erected altars as boundaries of his Indian campaign in those parts of the Indies he arrived at, which were situated farthest towards the east, in imitation of Hercules and Bacchus.[1291] That this custom existed, then, cannot be doubted.