If the priest of Nemi posed not merely as a king, but as a god of the grove, we have still to ask, What deity in particular did he personate? The answer of antiquity is that he represented Virbius, the consort or lover of Diana. But this does not help us much, for of Virbius we know little more than the name. A clue to the mystery is perhaps supplied by the Vestal fire which burned in the grove. For the perpetual holy fires of the Aryans in Europe appear to have been commonly kindled and fed with oak-wood, and in Rome itself, not many miles from Nemi, the fuel of the Vestal fire consisted of oaken sticks or logs, as has been proved by a microscopic analysis of the charred embers of the Vestal fire, which were discovered by Commendatore G. Boni in the course of the memorable excavations which he conducted in the Roman forum at the end of the nineteenth century. But the ritual of the various Latin towns seems to have been marked by great uniformity; hence it is reasonable to conclude that wherever in Latium a Vestal fire was maintained, it was fed, as at Rome, with wood of the sacred oak. If this was so at Nemi, it becomes probable that the hallowed grove there consisted of a natural oak-wood, and that therefore the tree which the King of the Wood had to guard at the peril of his life was itself an oak; indeed, it was from an evergreen oak, according to Virgil, that Aeneas plucked the Golden Bough. Now the oak was the sacred tree of Jupiter, the supreme god of the Latins. Hence it follows that the King of the Wood, whose life was bound up in a fashion with an oak, personated no less a deity than Jupiter himself. At least the evidence, slight as it is, seems to point to this conclusion. The old Alban dynasty of the Silvii or Woods, with their crown of oak leaves, apparently aped the style and emulated the powers of Latian Jupiter, who dwelt on the top of the Alban Mount. It is not impossible that the King of the Wood, who guarded the sacred oak a little lower down the mountain, was the lawful successor and representative of this ancient line of the Silvii or Woods. At all events, if I am right in supposing that he passed for a human Jupiter, it would appear that Virbius, with whom legend identified him, was nothing but a local form of Jupiter, considered perhaps in his original aspect as a god of the greenwood.