Once upon a time, the sixth son of King Hung Vuong the Fifth named An-Tiem disobeyed the King's order and was exiled to a deserted island.
The Prince had to build his own shelter, dig a well for water, and fish and hunt animals for food. One day, he found a green fruit as big and round as a ball. He split the fruit into halves and found the inside of the fruit red. He dared not eat it because he was afraid it was poisonous.
Days passed and the dry and sunny season came. It was so hot that all the plants were dry and the well had no water left. One day An-Tiem was so tired and thirsty that he tasted the fruit He found out that it tasted delicious and quenched his thirst. He tried to grow the plant around his house then. Soon the whole island was covered with the green fruit.
An-Tiem carved the island's name and his own on some of the fruit and threw them into the sea. Later, seamen found the strange fruit with An-Tiem's name floating in the sea.
Soon, words about the fruit reached the continent and many merchants tried to find the way the island. This then turned the deserted island into a busy island. The island was now crowded. Many boats came and went. An-Tiem helped anyone who wanted settle on the island. Soon, news about that reach the King.
King Hung Vuong was very proud of having a son who was brave and strong enough to overcome difficulties without anyone's help. An-Tiem was immediately summoned back to the court. He brought his fruit with him to offer the King, his father. The King gave him his crown and An-Tiem became King Hung Vuong VI.
Since then the fruit which was called "dua hau" and has become the symbol of luck; people often offer it to relatives and friends as a New Year present.