For most of his reign , he did not use the title of emperor , but used the title Heavenly Prince ( Tian Wang ) .
He was the son of the founding emperor Yao Chang ( Emperor Wucheng ) .
For most of son 's reign , son did not use the title of emperor , but used the title Heavenly Prince ( Tian Wang ) .
He was the son of the founding emperor Yao Chang ( Emperor Wucheng ) .