The Sui Emperors were from the northwest military aristocracy, and emphasized that their patrilineal ancestry was ethnic Han, claiming descent from the Han official Yang Zhen traced his patrilineal ancestry to the Zhou dynasty kings.
The Sui Emperors were from the northwest military aristocracy, and emphasized that their patrilineal ancestry was ethnic Han, claiming descent from the Han official Yang Zhen. ' Book of Sui, and the New Book of Tang traced his patrilineal ancestry to the Zhou dynasty kings.