Citadel of the Ho Dynasty

The citadel of the Ho Dynasty was built in 1397 by Ho Quy Ly who was the highest-ranking mandarin of the Tran Dynasty at the time. After the citadel was completed, Ho Quy Ly forced King Tran Thuan Tong to move the capital from the citadel of Thang Long (Ha Noi) to Thanh Hoa. In the second month of the year of Dragon (1400), after coming to the crown to replace the King Tran, Ho Quy Ly renamed the country Dai Ngu (1400-1407), the citadel of the Ho Dynasty officially became the capital citadel. The citadel of the Ho Dynasty is also known as names of An Ton, Tay Do, Tay Kinh, Tay Nhai,Tay Giai.

The Citadel of the Ho Dynasty is considered as the only stone citadel remaining in Southeast Asia and is one of the few remains in the world.

The citadel of the Ho Dynasty has met the two criteria specified in the World Heritage Convention. It is the criterion, "to exhibit an important interchange of human values, over a span of time or within a cultural area of the world, on developments in architecture or technology, monumental arts, town-planning or landscape design," and the criterion, "to be an outstanding example of a type of building, architectural or technological ensemble or landscape which illustrates significant stage in human history."

The citadel has recognized as a World Cultural Heritage by the UNESCO at the 35th session of the World Heritage Committee on June 27th 2011 in Paris (France).