It might actually be because he will have more power from other characters. So he might just use four emperors to symbolyse his multiple (future) powers. Or just a mistranslation. Who knows...

Thank you for the chapter. I just discovered your story and I have been hooked. Continue like that, it's been a long time since the last time I have been able to binge read a story. Recently, there haven't been any good story. But your's is very good. I hope they will have a tank in the party.

Oh wow, what a twist! Did you Sirius-ly killed him?! I did not thought that you would have chosen this path. And thank you for the chapter!