“The legend goes that Lạc Long Quân, the King of the Dragonkind, lived in and reigned over Vietnam in about 3,000 BCE. Sometime in his life he married Âu Cơ, who was a goddess of birds. Quân fathered 100 children who all hatched at the same time with Âu Cơ. Once they were all born, the King and his wife realized that they could not live together anymore and raise all of the children together, so they split and the King went to the coast with 50 kids and the wife went to the mountains with the other 50. According to the legend, all of the Vietnamese people of today are directly descended from these 100 children, making us all dragon people.”
This legend was collected from one of my friends. He is fully racially Vietnamese, and both of his parents emigrated from Vietnam to the US when they were adults. He said his parents try to keep their Vietnamese traditions alive, mostly through cooking traditions, but also through some stories. This is the only one he really remembers clearly. To him, it’s important because his parents identify strongly with it. They don’t actually believe that they are part dragon, but the myth takes on a more significant metaphorical meaning. I don’t really know enough about Vietnamese culture, but I could imagine that this myth provides the Vietnamese with a sense of unity as well as a divide between the mountainous peoples and the coastal peoples of Vietnam.