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Co Loa Citadel is the first fortified citadel recorded in Vietnamese history, This is perhaps the most ancient Citadel in Vietnam, built by Thuc An Duong Vuong in III Century BC. The Citadel was built to conform to a helicoidal design and comprises 3 turns: the exterior, the medium and the interior turn. At the base of the exterior rampart, was a deep moat, where boats could go to and easily. Now the remaining vestiges are the Communal House of Co Loa, the temple devoted to the worship of the Princes My Chau and that devoted to the worship of An Duong Vuong, the King who loved his daughter with all his heart, but lacking vigilance, he left Co Loa and lost both his family and his country.