Of the worship of Diana at Nemi two leading features can still be made out. First, from the votive-offerings found in modern times on the site, it appears that she was especially worshipped by women desirous of children or of an easy delivery.(6) Second, fire seems to have played a foremost part in her ritual. For during her annual festival, celebrated at the hottest time of the year, her grove was lit up by a multitude of torches, whose ruddy glare was reflected by the waters of the lake; and throughout the length and breadth of Italy the day was kept with holy rites at every domestic hearth.(7) Moreover, women whose prayers had been heard by the goddess brought lighted torches to the grove in fulfilment of their vows.(8) Lastly, the title of Vesta borne by the Arician Diana(9) points almost certainly to the maintenance of a perpetual holy fire in her sanctuary.
At her annual festival all young people went through a purificatory ceremony in her honour; dogs were crowned; and the feast consisted of a young kid, wine, and cakes, served up piping hot on platters of leaves.(10)
But Diana did not reign alone in her grove at Nemi. Two lesser divinities shared her forest sanctuary. One was Egeria, the nymph of the clear water which, bubbling from the basaltic rocks, used to fall in graceful cascades into the lake at the place called Le Mole.(11) According to one story the grove was first consecrated to Diana by a Manius Egerius, who was the ancestor of a long and distinguished line. Hence the proverb “There are many Manii at Ariciae.” Others explained the proverb very differently. They said it meant that there were a great many ugly and deformed people, and they referred to the word _Mania_ which meant a bogey or bugbear to frighten children.(12)
The other of these minor deities was Virbius. Legend had it that Virbius was the youthful Greek hero Hippolytus, who had been killed by his horses on the sea-shore of the Saronic Gulf. Him, to please Diana, the leech Aesculapius brought to life again by his simples. But Jupiter, indignant that a mortal man should return from the gates of death, thrust down the meddling leech himself to Hades; and Diana, for the love she bore Hippolytus, carried him away to Italy and hid him from the angry god in the dells of Nemi, where he reigned a forest king under the name of Virbius. Horses were excluded from the grove and sanctuary, because horses had killed Hippolytus.(13) Some thought that Virbius was the sun. It was unlawful to touch his image.(14) His worship was cared for by a special priest, the Flamen Virbialis.(15)