What is the historical prototype of Xu Fengnian?

Xu Fengnian is the protagonist of the online novel "Knife in the Snow", written by Xuan Xia, the screenwriter of the bonfire drama.

Xu Fengnian, who came to the world as the Zhenwu Emperor, was the emperor of Daqin (the queen was Luoyang) in his previous life, an unknown Taoist, a former founder of Guanyin Sect (a master surnamed Jing), and now he is reincarnated as Xu Fengnian.

Xu Fengnian's identity is the prince of the Northern Liang Dynasty, and he is famous for his ten thousand images. In fact, he has a good plan in mind.

Main contents:

Xu Fengnian experienced the reincarnation of Emperor Daqin, the prodigal son on the land, the quiet master of Guanyin Sect, the Zhenwu Emperor, and finally came down to earth as Zhenwu Emperor.

Later, in order to completely divide the boundaries with previous lives and struggle for life, he broke away from the past and became a king of Beiliang who struggled for himself and the fate and future of Beiliang. However, at first, Xu Fengnian didn't know all the identities of his past lives. At first, he was the prince of the Northern Liang King, but because he didn't wake up, he only knew that he lived a life that spanned his children all day. It was not until his father Xiao Xu kicked him out of the house that he began to really plan his great struggle after meeting his master Li Yishan.