Erice, The Myth

The mountain, called Monte San Giuliano, is a wholly isolated peak, rising in the midst of a low undulating tract, which causes its elevation to appear much more considerable than it really is, so that it was regarded in ancient as well as modern times as the most lofty summit in the whole island next to Aetna, though its real elevation does not exceed 2184 English feet Hence we find Eryx alluded to by Virgil and other Latin poets as a mountain of the first order of magnitude, and associated with Athos, Aetna, etc. On its summit stood a celebrated temple of Venus or Aphrodite, founded, according to the current legend, by Aeneas, from whence the goddess derived the surname of Venus Erycina, by which she is often mentioned by Latin writers.
Another legend, followed by Diodorus, ascribed the foundation both of the temple and city to an eponymous hero named Eryx, who was said to have received Hercules on his visit to this part of Sicily, and contended with that hero in a wrestling match, but was vanquished by him. This Eryx was a son of Aphrodite and Butes, a king of the country, and is hence repeatedly alluded to by Virgil as a brother of Aeneas, though that poet does not refer to him the foundation of the city. The legends which connected it with Aeneas and a Trojan chief named Elymus evidently pointed to what we learn from Thucydides as an historical fact, that Eryx as well as Segesta was a city of the Elymi, a Sicilian tribe, which is represented by almost all ancient writers as of Trojan descent.

source: Wikipedia