High Valyrian from 'Game of Thrones' has four genders. Here's why.

Like any language, High Valyrian — the Targaryens' mother tongue in Game of Thrones and House of the Dragon — has its own grammar and rules. These come courtesy of linguist David J. Peterson, an avid language creator who constructed High Valyrian and Dothraki for HBO's hit fantasy series. He is also responsible for developing...