Plutarch, Numa
Bernadotte Perrin, Ed.

10. In the beginning, then, they say that Gegania and Verenia were consecrated to this office by Numa, who subsequently added to them Canuleia and Tarpeia; that at a later time two others were added by Servius, making the number which has continued to the present time. It was ordained by the king that the sacred virgins should vow themselves to chastity for thirty years; during the first decade they are to learn their duties, during the second to perform the duties they have learned, and during the third to teach others these duties. [2] Then, the thirty years being now passed, any one who wishes has liberty to marry and adopt a different mode of life, after laying down her sacred office. We are told, however, that few have welcomed the indulgence, and that those who did so were not happy, but were a prey to repentance and dejection for the rest of their lives, thereby inspiring the rest with superstitious fears, so that until old age and death they remained steadfast in their virginity.

[3] But Numa bestowed great privileges upon them, such as the right to make a will during the life time of their fathers, and to transact and manage their other affairs without a guardian, like the mothers of three children. When they appear in public, the fasces are carried before them, and if they accidentally meet a criminal on his way to execution, his life is spared; but the virgin must make oath that the meeting was involuntary and fortuitous, and not of design. [4] He who passes under the litter on which they are borne, is put to death. For their minor offences the virgins are punished with stripes, the Pontifex Maximus sometimes scourging the culprit on her bare flesh, in a dark place, with a curtain interposed. But she that has broken her vow of chastity is buried alive near the Colline gate. Here a little ridge of earth extends for some distance along the inside of the city-wall; the Latin word for it is ‘agger.’ [5] Under it a small chamber is constructed, with steps leading down from above. In this are placed a couch with its coverings, a lighted lamp, and very small portions of the necessaries of life, such as bread, a bowl of water, milk, and oil, as though they would thereby absolve themselves from the charge of destroying by hunger a life which had been consecrated to the highest services of religion. [6] Then the culprit herself is placed on a litter, over which coverings are thrown and fastened down with cords so that not even a cry can be heard from within, and carried through the forum. All the people there silently make way for the litter, and follow it without uttering a sound, in a terrible depression of soul. No other spectacle is more appalling, nor does any other day bring more gloom to the city than this. [7] When the litter reaches its destination, the attendants unfasten the cords of the coverings. Then the high-priest, after stretching his hands toward heaven and uttering certain mysterious prayers before the fatal act, brings forth the culprit, who is closely veiled, and places her on the steps leading down into the chamber. After this he turns away his face, as do the rest of the priests, and when she has gone down, the steps are taken up, and great quantities of earth are thrown into the entrance to the chamber, hiding it away, and making the place level with the rest of the mound. Such is the punishment of those who break their vow of virginity.