During the 6th Hung Vuong dynasty, in a village, there was a couple of very gentle old men and women, who worked hard and had a reputation for being a blessing or helping people. They were very old but still did not have a child. One day the old woman went out to the field and saw a very large footprint, she curiously put her foot on it to try to see how much inferior it was. Unexpectedly at home she was pregnant. Nine months and ten days later, she was still not born, the old man was expecting the hello of the baby but he fell ill and died. Twelve months later she gave birth to a very handsome boy. She named her son Giong. But how strange! Until the age of three, the child could not speak, laugh, or walk. At that time, An enemies came to invade our country, led by An Vuong, famous for his cruelty, wherever he went, he sent the army to kill people and burn the house. The people were scared and angry. The king had many times sent the siege army but could not. Uneasy about the country, the king sent Ambassador to go around looking for talented people to save the country. Everywhere the Ambassador went, he shouted:

- Hey everyone! An enemy was aggressive, where talented people were, and people kept saving the country. Hearing the loudspeaker of the Ambassador, Giong, who was lying down, suddenly got up to call his mother:

- Mom, please come and invite the Ambassador here for me. Giong's mother was glad that I could say it, but when I heard her prompt to invite the Ambassador, she stopped:

- You're like this, how can you fight the enemies?

Giong was still determined:

- Just come out and invite the ambassador here for me.

The mother had to invite the Ambassador in, come in a place where there were no heroes and heroes found, only a three-year-old boy was sitting on the bed, the enraged Ambassador tried to leave, then Giong spoke, chanting:

- Ambassador, go back to the king, cast me an iron horse, an iron armor, an iron whip and I will destroy these enemies.