During the second resistance war against Mongolia, the two dynasties of Vietnam and Champa stood together on the front line against the common enemy. The close alliance made Emperor Tran Nhan Tong during his journey to Chiem Thanh in 1301 promised to marry his youngest princess, Princess Huyen Tran, to the young and powerful neighboring king. Huyen Tran Princess was about 14 years old at that time.
Five years later, when Huyen Tran was an adult, the ambassador came to the capital to ask for a ceremony. The court of Dai Viet wondered, finally King Anh Tong fulfilled the promise of the emperor, and Princess Huyen Tran sacrificed her own love, for the nation accepted to marry Che Man. The embassy offered the land of Chau O, Chau Ly as wedding presents (the land of Thuan Hoa - Phu Xuan - Thua Thien Hue today) and brought the princess back to Vijaya.
In July 1306, the fleet sailed south. At the gate of O Long, the boat stopped to rest. Moved by the sacrifice of his sister, King Anh Tong changed the name of this sea gate, Tu Dung Hai Mon, to express his feelings and remind the next life to forever remember the sacrifice for the great meaning of the Vietnamese princess.
Later dynasties declared her a patroness. The Nguyen Dynasty King gave a tribute to the princess "in keeping the nation for the people, with many inspirations", raising her rank of as monk "Trai Tinh Trung Dang Than". To remember the Princess' merit, the Nguyen Dynasty established the Dai De Vuong temple in Lich Doi village, Phuong Duc ward, Hue City, worshipping the founders of the nation, including Princess Huyen Tran. Unfortunately, this temple no longer exists today. By early 2006, the Huyen Tran Cultural Center was under construction. A year later, on March 26, 2007, the project was inaugurated on the 700th anniversary of Thuan Hoa - Phu Xuan.
Huyen Tran Temple Festival is held annually on the 9th of January - the anniversary of Princess Huyen Tran's death, with the meaning of gratitude for her merit for the development of Dai Viet country.