Romulus (2.3-2.4)

Others say it was Roma, a daughter of the Trojan woman I have mentioned, who was wedded to Latinus the son of Telemachus and bore him Romulus; others that Aemilia, the daughter of Aeneas and Lavinia, bore him to Mars; and others still rehearse what is altogether fabulous concerning his origin. For instance, they say that Tarchetius, king of the Albans, who was most lawless and cruel, was visited with a strange phantom in his house, namely, a phallus rising out of the hearth and remaining there many days.

Now there was an oracle of Tethys in Tuscany, from which there was brought to Tarchetius a response that a virgin must have intercourse with this phantom, and she should bear a son most illustrious for his valour, and of surpassing good fortune and strength. Tarchetius, accordingly, told the prophecy to one of his daughters, and bade her consort with the phantom; but she disdained to do so, and sent a handmaid in to it.