Emperor Jing of Han
Liu Xiangdao's family was from what would become Wei Prefecture (魏州, part of modern Handan, Hebei), and claimed ancestry from Liu Pengzu (劉彭祖), a son of Emperor Jing of Han. His father Liu Linfu (劉林甫) served as a mid-level official in the administrations of Tang's founder Emperor Gaozu and Emperor Taizong, and carried the title of Baron of Leping. Liu Linfu died in 629, and Liu Xiangdao inherited the title.