Sonam Tsemo, the son of Sachen Kunga Nyingpo, was the second of the five founding patriarchs of the Sakya tradition. He was also the fourth Sakya Tridzin at Sakya Monastery, although he served as active head of the monastery for only a few years. ... read more at
Sakya - The Sakya tradition developed in the eleventh century in the Khön family of Tsang, which maintained an imperial-era lineage of Vajrakīla and which adopted a new teaching from India known as Lamdre. Tib ས་སྐྱ་