Zhiesj Sith'tar, or more commonly known as Ancient Sith was the language of the natives on Ziost and Korriban years before the Republic's establishment. The language became extinct around the same time as the original natives on Korriban and Ziost died out, however, Zhiotka Djaktha and his followers brought the language back to life on Ziost decades later. The number of fluent speakers was unknown, however during the Hundred Year Sith Wars and possibly even about a hundred years later, every settler or native spoke the language fluently on both Ziost and Korriban.