The one who initiated the development was Wu-hsiang (684-762), originally a native of the Silla kingdom in the Korean peninsula and more well-known in China as Monk Kim.
Musang reduced all of Ch’an teachings to the three phrases of "not remembering," which he equated with morality, "not thinking," with samādhi, and "not forgetting," with wisdom.
[4]Chan Buddhism was introduced to the Nyingma school of Tibetan Buddhism in three principal streams: the teachings of Kim Hwashang transmitted by Sang Shi[5] in c750 CE; the lineage of Baotang Wuzhu was transmitted within Tibet by Yeshe Wangpo; and the teaching of Moheyan, which were a synthesis of the East Mountain and Baotang schools.
[7] This legendary "great debate" was known as "the Council of Lhasa" and is narrated and depicted in a specific cham dance held annually at Kumbum Monastery, Qinghai.
[8] Ray (2005) holds that the first documented dissemination of Chan to Tibet, chronicled in what has become known as the Statements of the Sba Family, occurred around 761 when Trisong Detsen sent a party to Yizhou to receive the teachings of Kim Hwashang, whom they encountered in Sichuan.