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Sonam Tsemo, 1142-1182, also called Lobpon Sonam Tsemo (bsod nams rtse mo) of the Khon family was the second of the Sakya Jetsun Gongma Nga, (sa skya rje btsun gong ma lnga) who were the five founding patriarchs of the Sakya order. He was also the fourth Sakya throne holder, although he served as active head of the monastery for only a few years. His mother was called Machig Odron (ma gcig 'od sgron). Like his father he remained a layman throughout his life, although he never married or had children. He was identified as the reincarnation of the Indian scholar Durgachandra (or Durjayachandra) the master of Drogmi Lotsawa Shakya Yeshe's ('brog mi lotsawa shakya ye shes) teacher Viravajra, in India.