Why is the Hung King's Commemoration Day on the 10th of the 3rd Lunar Month?

“A man has a grandfather and a father, like a tree has roots and a river has a source.”

“No matter where you go, remember the Ancestor's Death Anniversary on March 10th.”

These folk songs have been deeply engraved in the minds of every Vietnamese person. Because every year, when the Hung King's Commemoration Day comes on the 10th day of the 3rd lunar month, you will surely hear someone mention the above melodies many times, as an effective and unique way of passing on to future generations, a heroic chapter of the early history of the founding of the country by our ancestors.