He also created his son Yao Hong as crown prince and other sons as dukes .
Also in 402 , Yao Xing created his concubine Consort Zhang empress .
Yao Xing also created Yao Xing 's son Yao Hong as crown prince and other sons as dukes .
Also in 402 , Yao Xing created his concubine Consort Zhang empress .