Śūraṅgama Sūtra
The Śūraṅgama Sūtra was translated into Tibetan probably during the late eighth to early ninth century. However possibly because of the persecution of Buddhism during King Langdarma’s reign (ca. 840-841), only a portion of Scroll 9 and Scroll 10 of the Śūraṅgama Sūtra are preserved in the surviving two ancient texts. Interesting enough, Buton Rinchen Drub Rinpoche mentioned that one of the two texts was probably translated from Chinese; thereby suggesting the second text may have possibly been translated from Sanskrit (or another language).