In 253 BCE the great grandfather of Qin Shihuang unified the imperial cult of the four forms of God in Yong, constructing there altars for the White, Green, Yellow and Red Deities. In 219, Qin Shihuang, founder of the Qin empire (221 BCE-206 BCE), personally sacrificed at Mount Tai, the sacred mountain at the centre of Shandong, a site for the worship of the supreme godhead in the erstwhile states of Qi and Lu. He modelled the sacrifice on that performed at Yong, in alignment with the Qin tradition, consisting of three types of victims—horses, rams and oxen.