Sönam Tsemo
Sönam Tsemo (1142-1182) - one of the five patriarchs of the Sakya school, author of a famous commentary on the Bodhicharyavatara. He was a direct student of Chawa Chö Seng [phya ba chos seng] (1109-1169) and based his commentary on his teacher Chawa Chö Seng’s own commentary.