[Sidenote: The Vestal Virgins seem to have been regarded as the wives of the fire-god.] Now we may take it as certain that the Romans and Latins would never have traced the descent of their kings from Vestal Virgins unless they had thought that such a descent, far from being a stain, was, under certain circumstances, highly honourable. What the circumstances were that permitted a Vestal to become a mother, not only with impunity but with honour and glory, appear plainly from the stories of the birth of Caeculus, Romulus, and Servius Tullius. If she might not know a mortal man, she was quite free, and indeed was encouraged, to conceive and bear a son to the fire-god. In fact the legends suggest that the Vestals were regularly regarded as the fire-god’s wives. This would explain why they were bound to chastity during their term of service: the bride must be true to her divine bridegroom. And the theory of chastity could be easily reconciled with the practice of maternity by allowing a man to masquerade as the fire-god at a sacred marriage, just as in Egypt the king disguised himself as the god Ammon when he wedded the queen,[648] or as among the Ewe tribes the priest poses as the python-god when he goes in to the human brides of the serpent.[649] Thus the doctrine of the divine birth of kings presents no serious difficulty to people who believe that a god may be made flesh in a man, and that a virgin may conceive and bear him a son. Of course the theory of the divine motherhood of the Vestals applies only to the early regal and therefore prehistoric period. Under the Republic the demand for kings had ceased, and with it, therefore, the supply. Yet a trace of the old view of the Vestals as virgin mothers lingered down to the latest times in the character of Vesta herself, their patroness and type; for Vesta always bore the official title of Mother, never that of Virgin.[650] We may surmise that a similar belief and practice once obtained in Attica. For Erichthonius, king of Athens, is said to have been a son of the fire-god Hephaestus by the virgin goddess Athena: the story told of his miraculous birth from the ground, which had been impregnated by the seed of the fire-god, is clearly a later version devised to save the virginity of his mother.[651] The perpetual lamp of Athena, which burned in the Erechtheum or house of Erechtheus (who was identical with Erichthonius) on the acropolis of Athens,[652] may have answered to the perpetual fire of Vesta at Rome; and it is possible that the maidens called Arrephoroi or Errephoroi, who dwelt close to the Erechtheum,[653] may at one time have personated Athena and passed, like the Vestals, for wives of the fire-god.