Diana, although a female deity, has exactly the same functions, preserving mankind through childbirth and royal succession. Dumezil's interpretation appears deliberately to ignore that of James G.
Frazer, who links Diana with the male god Janus as a divine couple.
Another testimony to the high antiquity of her cult is to be found in the lex regia of King Tullus Hostilius that condemns those guilty of incest to the sacratio to the goddess.
Diana was worshipped at a festival on August 13, when King Servius Tullius, himself born a slave, dedicated her temple on the Aventine Hill in the mid-6th century BC.
transcendent heavenly power and abstention from direct rule in worldly matters, did not share the fate of other celestial gods in Indoeuropean religions—that of becoming dei otiosi or gods without practical purpose, since they did retain a particular sort of influence over the world and mankind.
The celestial character of Diana is reflected in her connection with inaccessibility, virginity, light, and her preference for dwelling on high mountains and in sacred woods.
It is derived from Proto-Indo-European *d(e)y(e)w, meaning "bright sky" or "daylight"; the same word is also the root behind the name of the Aryan Vedic sky god Dyaus, as well as the Latin words deus (god), dies (day, daylight), and "diurnal" (daytime).
The origin of the ritual of the rex Nemorensis should have to be traced to the legend of Orestes and Iphigenia more than that of Hippolitos.
The Scandinavian god Heimdallr performs an analogous function: he is born first and will die last.
He too gives origin to kingship and the first king, bestowing on him regal prerogatives. Pairault in her essay on Diana qualifies Dumézil's theory as "impossible to verify".
Modern scholars mostly accept the identification.... people regard Diana and the moon as one and the same. the moon (luna) is so called from the verb to shine (lucere).
Lucina is identified with it, which is why in our country they invoke Juno Lucina in childbirth, just as the Greeks call on Diana the Light-bearer.
Diana, therefore, reflects the heavenly world (diuum means sky or open air) in its sovereignty, supremacy, impassibility, and indifference towards such secular matters as the fates of mortals and states.