Legend has it that in ancient times, the Yellow Emperor fought Chi You for nine rounds and lost every time. He retreated to Mount Tai and hid there for three days and three nights. At his wit's end over how to defeat Chi You, the Yellow Emperor knelt and prayed to Heaven.
Just then, a mighty goddess with a human head and a bird's body appeared in the sky, riding a radiant, seven-colored cloud. The Yellow Emperor bowed and begged the goddess to teach him the secret art of defeating Chi You.
With the goddess's instruction in Qimen Dunjia and the Six Jia Yin-Yang Diagram, the Yellow Emperor defeated Chi You.
It is said that the goddess who taught the Yellow Emperor these arts was named Jiutian Xuannu. Ever since, the arts practiced by people have been named after this goddess, which is why they are also known as the Profound Arts.
