Wei Zheng
Wei Mo was born in 793, during the reign of Emperor Dezong. He was a fifth-generation descendant of the famed early Tang chancellor Wei Zheng, who had served a distinguished career under Emperor Taizong. Wei Mo's great-grandfather Wei Yin (魏殷), grandfather Wei Ming (魏明), and father — whose name was variously given as Wei Feng (魏馮) or Wei Ping (魏憑) all served as county magistrates.