The Kingdom of Tylwyth Teg is the kingdom of the fair folk. It is in Northern Prydain, under the The Ystrad River. It is home to Doli and King Eidileg. Appearances The Book of Three Tylwyth Teg is ruled by King Eidileg. Retrieved from "https://prydain.fandom.com/wiki/The_Kingdom_of_Tylwyth_Teg?oldid=3237" Categories: Places Community content is available under CC-BY-SA unless otherwise noted.