Sonam Tsemo (Tibetan: བསོད་ནམས་རྩེ་མོ, Wylie: bsod nams rtse mo, THL: sönam tsemo; 1142–1182) (or Lobpon Rinpoche Sonam Tsemo), an important Tibetan sprititual leader and Buddhist scholar, was the second of the so-called Five Venerable Supreme Sakya Masters of Tibet, the founding fathers of the Sakya tradition.[1]