Which dynasty was China in BC 1728?

BC 1728 was the reign of Xia Dynasty. Qi, the son of Xia Youyu, founded Yangcheng (now Dengfeng, Henan Province) in 2070 BC and died in 1600 BC. Jie, the last king of Xia Dynasty, was a tyrant. He compared himself to the sun and thought that the country would last forever. But in BC 1600, Xia, who was exiled by Jie, led the Shang army to perish.