Thread:Djamboe/@comment-26250681-20180331134927/@comment-34260483-20180404172104

It is because the territory where it is governed is important, an empire is so called because they expanded their domain, they took vassal states, those kingdoms/countries no longer have the same value. The emperor is superior to the kings of vassal states... But, Emperor Rugal and King Sete, have the same value because both domains rival in power.

In summary, there is a difference between vassal king, and kingdom king... It's quite complicated. Imperial Prince and Prince are basically the same (influence)

The created order is fine:

Emperor>  King>  Archduke > Imperial Prince > Prince> ​​​​​​Duke>  Marquis>  Earl>  Vizcount>  Baron>  Baronet>   Chevalier  

Grand Duke has not been mentioned in the novel.