It was not until the Ly dynasty (1009-1225) did “quan ho Bac Ninh” develop robustly and become the most popular festival which lasted up to half of a month. In ancient time, although the capital of Vietnam was located in Thăng Long (Hà Nội nowadays), every year when the spring came, Ly Kings always returned to their hometown - Kinh Bắc, to hold these exciting festivals.