During my stay in Thailand between 1971 and 1972, I found thirty three pieces of Dvaravati's Dharmacakras. Some of them are complete and some are broken. They are now preserved in the National Museums of Nakorn Pathom, U-T'ong and Bangkok, and also in Silpakorn University, etc.
My main Purpose in this paper is to date these Dharmacakras. According to the differences of decorative motifs on the rim of these Dharmacakras, they can be classified into six groups: Groups 1, 2, 3, 4, 5 and a non-ornamental group (fig. 4). The decorative motifs of Group I have significant resemblances to those found in Indian art, belonging to the period between 6th and 8th centuries. A more detailed examination of group one enables us to distinguish two types (which may be called type A [fig. 6, up] and type B). Type B, moreover, may be further subdivided, i. e. into type BI and type BII (fig. 6, middle and down). With regard to type A, it should be noted that the decorative motif bears a strong resemblance to those depicted on the pedestals of Sambor Prei Kuk (N. 10, S. I and group South). The latter, which are equally close to their Indian prototypes, can be dated back to the 7th century A. D. It may therefore be concluded that the Dharmacakras bearing type A decoration also date back to the 7th century A. D. Those pieces are No. 1, No. 2 and No. 3 in my catalogue (fig. 3).
The decorative motif of type B is really a degeneration of type A's motif, i. e. that of the alternating lozenge and lotus flower motifs on the wide ornamantal band on the rim. It is possible to trace the development from the original pattern of type A into the debased form of type B. In the latter there is a very definite row of beading on both sides of this band. The pieces pertaining to this type are: Nos. 4, 5, 6, 7 and 8 in my catalogue (fig. 3). These are likely to be later than type A and probably date back to the 8th century A. D.
Secondly, I analyzed the Dharmacakras I had collected and proceeded to prepare sketches of the four parts which constitute the structure of the Dharmacakra (fig. 8, 9, 10 and 11). I then collated all the diagrams of each part respectively, and by this process of comparison attempted to ascertain the relationship between the different elements of types A and B. As a result of this analysis, I was able to conclude that all the Dharmacakras found in Thailand can be divided into two main periods: the earlier ones, i. e. Nos. 1, 2, 3, 11, and 12: and the later ones, i. e. Nos. 4, 5, 6, 7, 8, 9, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 28, 30, 31 and 32 (fig. 3). The earlier ones may be dated to the 7th century and the later ones to the 8th century A. D.
The inscription on Dharmacakra No. 2, although pertaining to type A, is 8th century, judging from the style of the script. Of course it is possible the Dharmacakra was produced in the 7th century and the inscription added later, in the 8th century.
Finally, Several stone deer images were found with Dharmacakras in the compound of Pra Fathom Chei (fig. 1) at Nakorn Pathom. The finding of these fully confirmed that the texts of inscription No. 2 are concerned with the setting in motion of the Wheel of the Law dy the Buddha in his first sermon in the Benares deer park, which occasion the Dharmacakra symbolizes. This setting up of many Dharmacakras may be related to the legendary story of King As'oka's mission to Suvarnabhumi, which can be seen in Dipavamsa and Samantapasadika.
View full abstract