The terms imperium/imperator or empire/emperor were often employed for the German kingdom and its rulers, which indicates a recognition of their imperial stature but combined with "Teutonic" and "Alemannic" references a denial of their Romanitas and universal rule. The term regnum Germaniae (literally "Kingdom of Germany") begins to appear even in German sources at the beginning of the fourteenth century.
https://en.wikipedia.org/wiki/Kingdom_of_Germany#Terminology
end of debate? the emperor in waiting was also called 'king'. someone who rules over multiple kingdoms/duchies cannot be an archduke.
i'm only right because i'm the emperor. l'etat c'est moi, or something to that effect.
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