Going back to the period even before the migration of peoples Germanic tribal confederation didn't always have kings, but they did 'elect' dukes to lead them into battle or rather that's how the are referred to. Examples of these types of 'dukes' were Arminius, Widukind etc. In other words the office didn't only have Roman origins, but Germanic origins too (Herzog (or in Dutch hertog), a Heer is a German word for army, Dutch has a similar word heer, but that's only very rarely used in modern Dutch (in Dutch, the similarly written word heer (German equivalent Herr) means lord).
Though you're right that by the time of the Carolingians, it were commanders of 'military provinces defined by tribal settlement'.
Regarding Limburg, yes like Baden it was more like a courtesy. In this period there was a tendency to reduce the territorial extent of duchies; the duke as military commander of a 'province' lost authority over a number of counts too.
However these 'courtesy dukes' were even small by those standards, or you could say that they were ahead of their time.
Vratislaus II was granted a personal royal crown by HRE Henry IV in 1085. I also agree that it is an exception to the rule, which was hinted to as being possible again in the future (like during the negotiations of the Valois dukes of Burgundy with the HRE), but it never happened.
Regarding being subordinate it did indeed remain a part of the empire and as such the king of the Romans had (some) authority over it too, which happened a few times during crises with Rudolf I of Habsburg, Albert I of Habsburg (he made his son Rudolf (I), king of Bohemia, but he died during a seize, when he was establishing himself in his kingdom) and Henry VII of Luxembourg (he got his son John on the Bohemian throne).
There have been examples of vassal kingdoms too, but you could say that in a way Bohemia was the only 'stem duchy' left; I guess it was somewhat in the middle with an unique status in the empire (as the ranking imperial (as in of the realm) vassal with no equal).
Now that I think about it, before in later patches, much more kingdoms were added to the Holy Roman Empire, the in game representation of the position of Bohemia in the HRE wasn't done that badly in CK2. In the old versions the kingdom of Germany and the kingdom of Bohemia, belonged de jure to the HRE (as long as they are a vassal kingdom the 'imperial' crown authority and investiture laws apply, whereas any kingdom of Italy or Burgundy can set their own royal crown authority and investiture laws even as vassal kingdoms), whereas the kingdoms of Italy and Burgundy did not, nor did they belong to any other de jure empire, since those too were only added in later patches.
Obviously you could argue that Italy and Burgundy should be in the de jure HRE, but that's another debate, since representing that gives other challenges.
Though you're right that by the time of the Carolingians, it were commanders of 'military provinces defined by tribal settlement'.
Regarding Limburg, yes like Baden it was more like a courtesy. In this period there was a tendency to reduce the territorial extent of duchies; the duke as military commander of a 'province' lost authority over a number of counts too.
However these 'courtesy dukes' were even small by those standards, or you could say that they were ahead of their time.
Vratislaus II was granted a personal royal crown by HRE Henry IV in 1085. I also agree that it is an exception to the rule, which was hinted to as being possible again in the future (like during the negotiations of the Valois dukes of Burgundy with the HRE), but it never happened.
Regarding being subordinate it did indeed remain a part of the empire and as such the king of the Romans had (some) authority over it too, which happened a few times during crises with Rudolf I of Habsburg, Albert I of Habsburg (he made his son Rudolf (I), king of Bohemia, but he died during a seize, when he was establishing himself in his kingdom) and Henry VII of Luxembourg (he got his son John on the Bohemian throne).
There have been examples of vassal kingdoms too, but you could say that in a way Bohemia was the only 'stem duchy' left; I guess it was somewhat in the middle with an unique status in the empire (as the ranking imperial (as in of the realm) vassal with no equal).
Now that I think about it, before in later patches, much more kingdoms were added to the Holy Roman Empire, the in game representation of the position of Bohemia in the HRE wasn't done that badly in CK2. In the old versions the kingdom of Germany and the kingdom of Bohemia, belonged de jure to the HRE (as long as they are a vassal kingdom the 'imperial' crown authority and investiture laws apply, whereas any kingdom of Italy or Burgundy can set their own royal crown authority and investiture laws even as vassal kingdoms), whereas the kingdoms of Italy and Burgundy did not, nor did they belong to any other de jure empire, since those too were only added in later patches.
Obviously you could argue that Italy and Burgundy should be in the de jure HRE, but that's another debate, since representing that gives other challenges.
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