Śāntarakṣita first visited Tibet in 763 CE and a second time in 775, staying until his death. It was he who, according to Padma.kaʾi.thang.yig (The Clear Decree of Padma; a 15th-cent. terma), advised King Trisong Detsen (Khri.srong.lde.brtsan) to invite Padmasambhāva to Tibet on the basis of the latter's supernatural powers, because of magical opposition to Buddhist teaching from the native Bön religion. Śāntarakṣita's major works are Madhyamakālaṅkāra (Ornament of the Middle Way) with his own commentary, and Tattvasaṃgraha (Compendium of Reality), an assessment of the Indian schools.
"Śāntarakṣita." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (August 20, 2017). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/santaraksita
"Śāntarakṣita." The Concise Oxford Dictionary of World Religions. . Retrieved August 20, 2017 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/santaraksita