Lạc Long Quân and Âu Cơ - the Story of Origin

When looking at cultures with a long history, you inevitably come in contact with that culture's mythology.  Mythology often explains people, landmarks, and phenomenon from ancient times of this culture.
This myth is not about the origin or creation of the world, or about creation of humans.  Instead, the myth discusses the origin of Vietnamese people.  Of how Vietnamese culture came to be.
This story is about a bond created between immortal mountain fairies and mighty sea dragons. Thousands of years ago, Lạc Long Quân was born. His father was the ruler of the Xích Quỷ Kindom and his mother was a princess of the Động Đình Lake. Because of his mother’s origin, Lạc Long Quân was believed to be a descendant of dragons. He was fascinated with the ocean and was often seen exploring the ocean and sea creatures.
When it was Lạc Long Quân’s time to rule the Xích Quỷ Kindom, he protected his people against monsters, from sea monsters and 9 tailed foxes, to evil genies. He eventually fell in love with Âu Cơ, a mountain fairy and daughter of Đế Lai, ruler of the Northern Highlands.
Âu Cơ was not just a princess or partner. She was also a healer. She spent much time using her skills to heal people, and was powerful in her own right. So much so, that she was able to transform into bird form to trick monsters who might otherwise attack her.  Âu Cơ is seen as a symbol of female strength, someone who was powerful and independent.
They moved into Lạc Long Quân’s palace in the mountains and lived happily.  Time went by and according to legend, Âu Cơ gave birth to one hundred children. The children grew to be smart and skillful like their parents, learning how to nurture the lands of their kingdom. This was a joyous time for Lạc Long Quân and Âu Cơ.
Eventually Lạc Long Quân and Âu Cơ grew unhappy. Lạc Long Quân’s heart longed for the coast and sea, while Âu Cơ missed the mountains of her highland home.
They decided to separate, and Lạc Long Quân took 50 children to live along the coasts, and Âu Cơ took 50 children to live in the mountains. Despite separating, they promised each other that they must look after each other and support each other in times of need. Âu Cơ watched over the mountains while Lạc Long Quân ruled over the coastal lands.
The children of Lạc Long Quân and Âu Cơ are believed to be the ancestors of Vietnam, with many people of Vietnamese heritage calling themselves the children of the Dragon and the Fairy.