Evander, approached by the trembling shepherds, after he heard of the crime and the cause of the crime, looking on the shape of the man, [which was] larger and more impressive than a human shape, asked him what man [who] he was [subjunctive because indirect question]. When he learned his name [just 'name' here], father and native land, he said, "Son of Jupiter, Hercules, hail! My mother, a divine prophetess, foretold that you would increase the number of the gods and that an altar [not 'alter'] would be dedicated to you here [dicatum iri
) is the future passive infinitive], which the wealthiest nation on earth would one day [olim
] call the Ara maxima
. Having given Evander his hand, Hercules said that he would fulfill his destiny when the altar had been dedicated. On that spot for the first time, after an outstanding cow was taken from the herd, a sacrifice was performed to Hercules.
This is adapted from Livy 1.7; the story is also told in Vergil Aeneid
8.185 ff, when Aeneas visits Evander at the future site of Rome. The point is that this was the first time a sacrifice to Hercules was performed at the site of the Ara Maxima, which was restored by Augustus. By recounting the mythical history and significance of the altar, Livy and Vergil are writing propaganda for the Augustan regime.http://en.wikipedia.org/wiki/Great_Altar_of_Hercules