《资治通鉴·汉纪·汉纪三十八》
夏季，四月己卯，分出东平国部分封土，将前东平王刘苍之子刘尚封为任城王。
夏，四月，己卯，分东平国，封献王子尚为任城王。
In the summer, on the day of Ji Mao in April, part of the Dongping country was separated out, and Liu Shang, the son of Liu Cang, the former King of Dongping, was enfeoffed as King of Rencheng.