Constructed in 1402 by King Hồ Quý Ly, this citadel was originally named West Capital (Tây Đô). A square-shaped structure, it was originally surrounded by a deep moat. Very little of the original structure still survives today other than the four gates, which are in varying degrees of preservation. In 2004 archaeologists unearthed numerous valuable artefacts inside the walls of the citadel, including stone pillars and bars in the design style of the Lý and Trần dynasties and two overlapping foundations which are believed to have formed part of the main royal palace building. Another excavation of 2004, conducted some 2.5 kilometres from the citadel in Vĩnh Thanh Commune, unearthed a sacred worshipping site similar in concept to Nam Giao Esplanade in Huế. Here it is believed the king sought the mandate of heaven each year for his rule. In 2004 the provincial government also announced its intention to build a 15.6 hectare tourist compound close to the site at an estimated cost of 92 billion VNĐ (cUS$5.8 million). The compound will apparently incorporate a festival and cultural centre, a park, guest houses and hotels and public service areas; it is earmarked for completion in 2010.