Talk:Two-Volume Lexicon

Adam, kapstein writes in The Tibetan Assimilation of Buddhism: Conversion, Contestation, and Memory, page 229, note 31: However, by the early ninth century, when the emperor Khri Lde-srong-btsan issued his preface to the Sgra-sbyor-bam-gnyis (Simonsson 1957; Ishikawa 1990),

Thus, it seems scholars agree it was not during the time of Ralpachen but Senalek who wrote the preface.