Royal Library is located in the Forbidden Citadel. The Royal Library was the only monument undamaged in the Forbidden Citadel after the reoccupation of Hue by French troops in early 1947. It is the pavilion where the Emperors Nguyen came for reading and resting.
In 1821, by order of Emperor Minh Mang, a building was erected west of the Thieu Phuong Garden (Garden of Lingering Aroma), called the Tri Nhan Mansion (Mansion of Intellect and Mercy). It was later improved and renamed Thanh Ha Thu Lau (Writing Pavilion) by Emperor Thieu Tri, and then, by Dong Khanh as the Royal Library.
This pavilion, elaborately decorated with ceramic mosaics, faces a square-shaped pond with a lovely rock-garden. Left of the pavilion stands the Tu Phuong Vo Ngu Pavilion (Pavilion of No Worry) and right of it is the Hoa Nhat Thu Truong Gallery (Gallery of the Nourishing Sun). On the left of the Bat Phong Pavilion (Pavilion open to Eight Directions) is a small structure called the Luc Tri Than Thong Belvedere and on the right is the Than Tu Room (Morale Improving Room).
North of it is the Luc Giac (Hexagonal) Pavilion with Trach Trung Tasist Temple (Temple of Just Conduct) on the left. In front of this temple is the Duc Vien House (House of Full Virtue). Bridges and galleries are together connected, lakes and ponds smoothly flow into one another in a very poetic scenery.