The First Prince's name was Li Chengru.
According to the information provided, the name of the First Prince of the Qing Dynasty was unknown.
The name of the First Prince of Qing Yunian was unknown.
The name of the eldest prince, Qing Yunian, was unknown.
The name of the First Prince of Qingyu was unknown. Although the First Prince played an important role in the play, the author did not explicitly reveal his name. Thus, we have no way of knowing the name of the First Prince Qing Yunian.
The First Prince's name was Li Chengru.
The First Prince's name was Li Chengru.
The First Prince's name was Li Chengru.
According to the information provided, the name of the First Prince of the Qing Dynasty was unknown.
The First Prince's name was Li Chengru.
The First Prince's name was Li Chengru.