Citations:High Valyrian

Proper noun: "a constructed language, mentioned in the A Song of Ice and Fire novel series by George R. R. Martin, and developed for use in its television adaptation Game of Thrones"

 * 2015, Douglas Ball, "Constructed languages", in The Routledge Handbook of Language and Creativity (ed. Rodney H. Jones), pages 148-149:
 * The HBO series Games of Thrones, which premiered in 2011, has included the languages of Dothraki and High Valyrian, both created by David Peterson.
 * 2017, Dimitra Fimi & Andrew Higgins, "Invented Languages", in The Routledge Companion to Imaginary Worlds (ed. Mark J. P. Wolf), unnumbered page:
 * For the last season of the HBO series, Peterson also developed another invented language, High Valyrian, which, again, is only mentioned in Martin's original novels.
 * 2017, David M. Palfreyman, "Learner Autonomy and Groups", in Autonomy in Language Learning and Teaching: New Research Agendas, page 79:
 * Though two language courses (High Valyrian and Klingon) are constructed languages from popular TV series (Game of Thrones and Star Trek, respectively), there are reportedly more than 100,000 learners doing the High Valyrian course.
 * 2019, KellyAnn Fitzpatrick, Neomedievalism, Popular Culture, and the Academy: From Tolkien to Game of Thrones, page 113:
 * The use of High Valyrian mirrors the use of Latin both in the medieval Christian church and as a common language used among the educated elite.
 * 2020, Katrin Kohl, "Creative Languages", in Creative Multilingualism: A Manifesto (eds. Katrin Kohl ''et al.), page 238:
 * Peterson has even satisfied the growing desire among fans to learn High Valyrian by writing and voicing a Duolingo course in the language.
 * 2021, Yens Wahlgren, The Universal Translator: Everything You Need to Know about 139 Languages That Don't Really Exist, unnumbered page:
 * High Valyrian occupies the same position in George R.R. Martin's world as Latin historically does in ours.