The ruler of the hell, one day finally was done punishing all the evil corrupted souls in every way possible and this made the devil bored!
This happened just before when Adolf Hitler was stepping on decions to be remembered in the pages of the history(yeah we all hate it).
The devil on the other hand was tired of all the
things and he was fed up being a king! Yeah it was because he been ruling it before even the evil existed. Later when he was cast out as the king of evil from heaven