Game of Thrones: How one man created the Dothraki language from scratch

David J Peterson was teaching English Composition at Fullerton College, California, when he heard that HBO was accepting applications to develop Dothraki, the language of horse-mounted warriors, for Game of Thrones. Using the handful of words and phrases in George R R Martin's fantasy-novel series as a starting point, Peterson spent the next four years developing Dothraki grammar and writing a dictionary of around 3,400 words.