Ancient emperors didn't just use a name or a title, they wanted to establish their own unique existence. God ordered me to live forever.

If you want to do this, you must be different when addressing them. The princess or the king can also call them Chitose, but the emperor must live forever, which means that he is above ten thousand people. Even if his son dies, he just returns to the embrace of heaven and still exists.

This played a deterrent role in that ignorant era, and then naturally continued this title.

The other is that you are confident, and you want to tell others that your ability is unmatched by others, and you can enjoy this throne for a long time.

It's a psychological suggestion that you can sit on the throne for a long time, but it turns out to be useless. Throughout the history of China, every emperor was much shorter than his own minister, except for a few other examples.

Long live or short live, the title of emperor will eventually disappear in the long river of history.