There are two histories of girders, one is the Southern and Northern Dynasties, and the other is the Five Dynasties and Ten Kingdoms, but nirvana in the fire refers to the Liang State in the Southern and Northern Dynasties.

Liang was the two emperors after the death of Guo Yi in the Five Dynasties and Ten Kingdoms.

Xiao Jingyan in Nirvana in Fire was the seventh prince of Liang in the Southern and Northern Dynasties. After a series of complicated struggles, he finally became a saint. As for how many years he was in office, the prototype of Xiao Jingyan in history can be seen in this article.

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From this film and television work, we can also see how chaotic China was in the Southern and Northern Dynasties. Of course, this is just a film and television work. Just look at it. Don't take it too seriously. If it is too serious, it will be cruel.