Prior to the introduction of printing, the size of private collections in China had already seen an increase since the invention of paper. Fan Ping (215–84) had in his collection 7,000 rolls ("juan"), or a few hundred titles. Two centuries later, Zhang Mian owned 10,000 "juan", Shen Yue (441–513) 20,000 "juan", and Xiao Tong and his cousin Xiao Mai both had collections of 30,000 "juan". Emperor Yuan of Liang (508–555) was said to have had a collection of 80,000 "juan". The combined total of all known private book collectors prior to the Song dynasty number around 200, with the Tang alone accounting for 60 of them.