King Khai Dinh (reigned 1916–1925) ascended the throne during the final years of the Nguyen Dynasty, when the country was under French protectorate. Although his power was no longer as prominent as previous kings, he still dedicated much effort to constructing works with a personal mark, such as Kien Trung Palace, An Dinh Palace, and especially Ung Lang – his own tomb.
After a period of surveying the terrain, in 1920, the king chose the slopes of Chau Chu Mountain as his resting place. According to feng shui principles, this area possessed many auspicious elements with surrounding mountains and winding water bodies. The King renamed the mountain to Ung Son, while naming the project Ung Lang, conveying the desire for an eternal resting place amid nature.
The tomb officially commenced construction on September 4, 1920 under the command of Grand Marshal Le Van Ba. After King Khai Dinh passed away in 1925, the construction continued to be built and completed under King Bao Dai, reaching completion in 1931. With 11 years of construction, this tomb holds the longest construction period in the history of the Nguyen Dynasty. In a context of national hardship, the creation of the work was associated with considerable debate, but at the same time left behind a unique architectural masterpiece, reflecting the blend of traditional Vietnamese art and Western architecture.



