Ia or Y Son temple located on Ia mountain (Hiep Hoa district, Bac Giang province) and worships God Hùng Linh Công who made contributions in defeating An invaders. Y Son relic site consists of Ha (lower) temple, Thuong (upper) temple, Fairy well and Buddhist temple.
The legend of Hùng Linh Công joint Gióng Saint in defeating An invaders in the 6th Hùng King. The temple has been classified as a national historical - cultural relic since 1994.
Every year, the Y Son temple festival is held on the 15th, 16th and 17th days of the first lunar month to honor God Hùng Linh Công and his parents. The festival also has been listed a National Intangible Cultural Heritage by the Ministry of Culture, Sports and Tourism.
The Y Son relic site has been upgraded many times and still maintains its traditional values.
