Guo's ancestors were Guo Zhi, a doctor in the Xia Dynasty, and Guo Chong, a doctor in the late summer and early Shang Dynasty (not Guo Chong, the capital of Yingzhou cavalry in the late Tang Dynasty), both of whom were the beginning of Guo. According to ancient books, Yu took two dragons and Guo ruled. In ancient times, there was a country, Xia Youyu, and there was a commander in chief. Guo Zhi and Ai Guo are the earliest recorded Guo people in China. Therefore, Guo Zhi and Ai Guo, the Xia people who established ancient Guo countries such as Yangcheng (now Dengfeng, Henan) in ancient Chinese history, are regarded as the ancestors of Guo people by later generations. There are obviously two early Guo families, which can be traced back to the Xia and Shang Dynasties in China thousands of years ago.