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The citadel has the structure of an oyster shell with 3 turns: the exterior, the middle and the interior. Legends said that one night the white cocks badly damaged the citadel. The god of river knew the damage and mysteriously interfered by sending a holy tortoise to protect the citadel building. When the construction was completed, a magic bow was given to king An Duong Vuong to defeat the northern invaders from The Chinese King Trieu Da knew the story and planned to have his son, Prince Trong Thuy, marry Princess My Chau the daughter of King An Duong. Trong Thuy made use of the opportunity and stole this magic weapon. Visitors will also find the remains of the citadel and many vestiges here. The three ramparts archeological relics from the Bronze and Iron ages are 16km long. The complex of religious and commemorative relics includes Ngu Trieu Di Qui Communal House, My Chau Temple, and Bao Son Pagoda. Mystical relics such as Ngoc Well,
This is perhaps the most ancient citadel in 
War happened shortly after that, the Vietnamese king lost. He, together with his daughter committed suicide. Commemorating the king and the princess with their good deeds, his people constructed a temple to worship them which still remains intact up to now.
Source TCDLVN
