What we know of the age of the older caves is principally derived from a long inscription on the front of the oldest, known as the Hathi Gumpha, or Elephant Cave.[170] From it we learn that it was engraved by a king called Aira, who ascended the throne of Kalinga in his twenty-fourth year, and spread his power by conquest over neighbouring rajas. He seems at first to have vacillated between the Brahmanical and Buddhist faiths, but finally to have adopted the latter and distributed infinite alms. Among other good works, he is said “to have constructed subterranean chambers--caves containing a chaitya temple, and pillars.” Palæographically, the forms of the letters used in this inscription are identical with those used by Asoka in the copy of his edicts on the Aswatama rock close by, and that recently found at Aska, near the northern corner of the Chilkya lake. The first presumption, therefore, is that they may be of about the same date. This is justified by the mention of Nanda in the past tense, while there seems no reason for doubting that he was one of the kings of that name who immediately preceded the revolution that placed Chandragupta on the throne. Beside these, there are other indications in this inscription which seem to make it almost certain that Aira was contemporary with the great Mauryan dynasty of Magadha; but whether he preceded or followed Asoka is not quite so clear. Still it appears unlikely that Asoka would have been allowed to set up two copies of his edicts in the dominions of such powerful kings as Aira and his father seem to have been, and as unlikely that Aira should make such a record without some allusion to the previously promulgated edicts, had they then existed. On the whole, I am inclined to believe that Aira lived before Asoka, and, if so, that this is the oldest inscription yet found in India. Be this as it may, the cave in which it is found is certainly the oldest here. It is a great natural cavern, the brow of which has been smoothed to admit of this inscription, but all the rest remains nearly in a state of nature. Close to it is a small cave, the whole “fronton” of which over the doorway is occupied by a great three-headed Naga, and may be as old as the Hathi cave. The inscription on it merely says that it is the unequalled chamber of Chulakarma, who seems also to have excavated another cave, here called the Pawan Gabha,[171] or Purification Cave. Besides these, and smaller caves to be noticed hereafter, the great interest of the Udayagiri caves centres in two--the so-called Ganesa cave, and that called the Raj Rani, or Rani Hanspur, from a tradition--Hindu--that it was excavated by the Rani of Lelat Indra Kesari, the celebrated builder of the Bhuvaneswar temple in the 7th century. [Illustration: 70. Ganesa Cave. (From a Plan by Mr. Locke.) Scale 50 ft. to 1 in.]