Hau Lau (the Back Pavilion) lied behind the main group of architectural constructions in the Hanoi Citadel. According to fengshui (geomancy), the Pavilion would stand guard over the north of Hanh Cung, hence its another name Tinh Bac Lau. Legend has it that whenever the King went on long trips of inspection; his princess would make a stopover at the Pavilion. This gave account to its another name Lau Cong Chua (Princess's Pavilion).