The Valyrian languages are a fictional language family in the A Song of Ice and Fire series of fantasy novels by George R. R. Martin, and in their television adaptation Game of Thrones.In the novels, High Valyrian and its descendant languages are often mentioned, but not developed beyond a few words. For the TV series, linguist David J. Peterson created the High Valyrian language, based on the fragments given in the novels, as well as the derivative language Astapori Valyrian.