This article examines the development of early imperial ancestral shrines by exploring the Liye and Yuelu 嶽麓 Qin slips, along with other excavated texts and historical documents. It argues that Qin Shihuang's 秦始皇 court was the first to specify the regulations for the early imperial ancestral shrine, a crucial part of which was the establishment of the Taishang huang 太上皇 shrines throughout the realm, making the imperial ancestral cult part of the daily local administrative affairs. The Western Han courts largely adopted the regulations stipulated by Qin Shihuang in their commandery and kingdom shrines until late Western Han, when ritual reforms brought the imperial ancestral shrines closer to what Michael Loewe calls the Reformist vision, entailing potential conflicts between bloodlines and the hereditary order of succession. By no means did the early empires simply continue in the stipulations for the imperial ancestral shrines the royal practices of the pre-imperial period; instead, the precedents transmitted to Eastern Han reflected two major ritual reforms, with local ancestral shrines and personal participation by the emperor key subjects of debates.