abstract:Liu Fei (), also known as Prince Daohui of Qi (齊悼惠王) (died 189 BC) was the oldest son of Emperor Gaozu of Han and Consort Cao—initially Emperor Gao's mistress. When Emperor Gao was eventually victorious in the Battle of Gaixia in 202 BC, in that same year Emperor Gao made Liu Fei his oldest son Prince of Qi.