Is there an emperor named Cheng in history?

There are three emperors named Cheng in the history of Han nationality, not 36. They are:

1. Hao Cheng, Song Lizong, 1222? 1274 reigned as the fourth emperor of the Southern Song Dynasty.

2. Song Xiaozong? , 127 1 year? 1323 reigned as the ninth emperor of the Southern Song Dynasty.

3. The Empress of the Ming Dynasty (Zhu Qizhen, Ming Yingzong) instructed Shangshu to compile the Da Ming Calendar for the Huangli Bureau, which was composed of 30 volumes, called Da Ming Wanli, Li Qianzhi and Zhong Shu Biao.

Cheng is China's real surname, which originated from Ji's surname in Zhou Dynasty. It is one of the top ten surnames in ancient China and one of the most populous surnames in China. But there are not 36 emperors named Cheng in history.