《魏书·列传·卷二十三》
当时方士祁纤奏请立四王，用曰束西曰南北为名，想因此招致吉祥，祛除灾异。
时方士祁纤织奏立四王，以曰东西南北为名，欲以致祯吉，除灾异。
At that time, the alchemist Qi Qian requested to establish the Four Kings, named Yixi, Xinan, Nanbei, in the hope of attracting auspiciousness and eliminating disasters.