Hiis great - great - grandfather was Emperor Ming of Western Liang .
Great - great - grandfather 's great - granduncle Xiao Yu was a famed chancellor during the reigns of Tang Dynasty 's first two emperors , Emperor Gaozu and Emperor Taizong .
Hiis great - great - grandfather was Emperor Ming of Western Liang , and his great - granduncle Xiao Yu was a famed chancellor during the reigns of Tang Dynasty 's first two emperors , Emperor Gaozu and Emperor Taizong .