Bach Ma is one of most oldest temples of Hanoi. It was built between 866 to 1010. This temple is dedicated to Long Do (named Bach Ma), the protecting god of the capital Thanh Long. Long Do warned the country's ruler, Ca Bien, to listen to him. He was frightened by the warning and constructed the temple dedicated to the god. Another legend added that when Ly Cong Uan settled down in the capital (1010), he attempted to fortify the city but the fortress repeatedly collapsed. He went to the temple to pray one morning and suddenly a white horse came out of the temple and ran around the area where the fortress was being built. It left its footprints before it returned to the temple and disappeared. King Ly built the temple along the trail of footprints and it remained solid. The King promoted Long Do to tutelary god, defender of Thang Long with the additional name of Bach Ma. The most valuable relic in this temple is the statue of Long Do made from copper which has been there since the 18th century. It is located at 76 Hang Buom Street in the city's old quarter.