 The conceptions of the Supreme Ruler (Shang Di) and of the Sublime Heavens (Huang-t'ien) afterward coalesce or absorb each other.The earliest references to Shangdi are found in oracle bone inscriptions of the Shang Dynasty in the 2nd millennium BC, although the later work "Classic of History" claims yearly sacrifices were made to him by Emperor Shun, even before the Xia Dynasty.Shangdi was regarded as the ultimate spiritual power by the ruling elite of the Huaxia during the Shang dynasty