After their fall to the Jin, the Song lost control of North China. Now occupying what has been traditionally known as "China Proper," the Jin regarded themselves the rightful rulers of China. The Jin later chose earth as their dynastic element and yellow as their royal color. According to the theory of the Five Elements (wuxing), the earth element follows the fire, the dynastic element of the Song, in the sequence of elemental creation. Therefore, their ideological move showed that the Jin considered Song reign in China complete, with the Jin replacing the Song as the rightful rulers of China Proper.