Two problems here: (a) Thub-rgyal-nag-po’s identity and (b) his Sanskrit name. According some Tibetan sources, it is pre-Buddhist name of Mātṛceta (mentioned in Dan’s Tibskrit). Mi-pham (sKad gnyis shan sbyar, p. 329) states that he was Dignāga’s opponent. One and the same person? What would be his name in Sanskrit? Attested?