In the early 10th century, the founder of the Fayan School commented on Shenhui's lineage:  Shenhui's own lineage, called the Heze school, probably died out around the time of the Great Anti-Buddhist Persecution in 845. His best-known descendant in this school was Guifeng Zongmi, who was also the fifth patriarch of the Huayan school. According to Tsung-mi, Shen-hui's approach was officially sanctioned in 796, when "an imperial commission determined that the Southern line of Ch'an represented the orthodox transmission and established Shen-hui as the seventh patriarch, placing an inscription to that effect in the shen-lung temple". Shenhui's distinction between "gradual" versus "sudden" methods of enlightenment became a hallmark of Chinese Zen. Mazu Daoyi, whose Hongzhou school became the hallmark of Zen, was an early and important adopter of the "sudden" approach. His speeches were found again in Dunhuang.