The original name of the One Pillar Pagoda was Dien Huu Pagoda, which literally means "long lasting happiness and good luck". The pagoda is located in the western part of the city on Ong Ich Khiem St., near Ho Chi Minh's Mausoleum. It was first built in 1049, during the reign of Emperor Ly Thai Tong. According to legend, ageing Emperor Ly Thai Tong, who had no children, often went to pagodas to pray to Buddha for a son. One night, he dreamed that he was granted a private audience with Buddha Buddha, who was seated on a lotus flower in a square-shaped lotus pond on the western side of Tnang Long Citadel, gave the king a baby boy. Months later, when the queen gave birth to a male child, the Emperor ordered the construction of a pagoda supported by only one pillar to resemble the lotus seat of his dream in the honour of Buddha. The pagoda is open daily from 8am to 5pm. Entrance is free