King Kung 6th had 20 sons, among them the 18th prince named Tiet Lieu was a very special one. One day in the dream, a celestial being gave Lang Lieu the idea of making two kinds of cake with the sticky rice and mung bean, surrounded by the phrynium leaves they are shaped round and square and dedicate them to the King as his gesture of respect and gratitude to the creator and the ones giving birth and fostering him. King Kung 6th was very pleased! He thus decided to choose Lang Lieu’s cakes to make offerings to Heaven and Earth and pay respect to the ancestors, and he passed his honorable throne to Prince Lang Lieu. King Kung 6th named the square cake “Banh Chung,” and named the round one “Banh Day.” Since then, every New Year, the tradition of making sticky rice cakes to make offering to the ancestors has become a custom of the Aulacese.