The legend that follows is one of the oldest of Vietnam, reputedly going back to the early years of the semi-legendary Hong Bang dynasty. It is probably of Taoist inspiration and affirms a belief in genie and immortals.

The third King Hung Vuong had a beautiful daughter named Tien-Dung (Divine Beauty), who, although of fairy-like loveliness, was endowed with a whimsical nature. Despite her father's entreaties, she rejected every offer of marriage, preferring, as she said, to remain single in order to satisfy her passion for visiting the many beautiful sites of her father's kingdom, known as Van Lang. As the king loved his daughter tenderly, he tried to please her in every way possible, even placing at her disposal a number of vessels including the royal barge, so that she could navigate the rivers of the realm.