High Valyrian is a fictional language created by author George R.R. Martin for his book series, A Song of Ice and Fire. It is spoken by the noble families of Valyria and is known for its complex grammar and rich vocabulary. The language reflects the culture and history of the Valyrian Freehold, a powerful civilization in the series. In the television adaptation, Game of Thrones, High Valyrian is used by characters such as Daenerys Targaryen. The language was further developed by linguist David J. Peterson, who created a comprehensive grammar and vocabulary for it, allowing fans to learn and use the language in various contexts.