It is generally accepted that the Khmer, Lao and Thai scripts are related, and are all ultimately of Brahmi origin. The exact nature of their relationship is disputed. The earliest Thai inscription has been dated to 1292 (although this has also been contested) and shows derivation from the Khmer script. However, the earlier parentage of the three scripts is harder to determine. It is widely suggested that both Lao and Thai are derived from Khmer, which is in turn derived from Pallava, a South Indian prototypical script.