The earliest physical evidence of the human use of cannabis seems to come from an ancient village site at Yuan-shan on the island of Taiwan. Broken pieces of pottery were found with hemp cord marks on their surface. These marks were formed by pressing hemp cord into the wet clay before it hardened. A rod-shaped stone tool that might have been used for pounding cannabis fibre was also found at this site.
Textile imprints have been found on pottery shards from other Neolithic sites in Asia. These finds suggest that the relationship between humans and the cannabis plant extends back to prehistoric times.
Source: Fleming, M.P. & Clarke, R.C. (1998). Journal of the International Hemp Assoc. 5(2), 80-92.