Okay so sort of posed this question before. That If Charlies V, Holy Roman Emperor had a second surviving son(uh, a legitimate son) and he chose to split the Habsburg lands into three. His Brother getting the Austrian Crown Land and eventually the big crown, while his son Phillipe got the Spanish holdings. While the low counties went to.. uh lets say Prince John.
Now the original question was Could Charlies declare the duchies and counties that made up the Burgundian inheritance a Kingdom. And the resounding answer was no, the Imperial Diet wouldn't stand for it and the only one who is allowed to be a King in the Empire was the Emperor, who was already the King of Germany, King of Italy and the King of Bohemia.
The Second question well could the Burgundian Inheritance be made into an Arch-Duchy. Again the answer was no. As an Arch -duchy was like the Highlander and their could only be one. but the role of an arch duchy would have work well as in the past Austria was made up of many smaller duchies that came an went.
So now here is the purpose of this thread. Can he create a Grand Duchy, specifically use the relatively useless title that was the Duke of Lothier, which he already had and just make it.... Grand. The title existed in the HRE way back to refer to the lands that made up the Duchy or Lower Lotharingia, but over time that duchy like Middle Francia before it continued to fracture into the seventeen provinces. The Duchy of Upper Lotharingia mostly stayed together and got to keep the Lotharingian name, although the it is better known as Lorraine. Now The holy Roman Empire did have a Grand Duchy a couple of years after Charles V's death, rewarded to Cosimo de' Medici,by the Pope after spending so many years busting heads and taking names. The then Emperor Maximilian II was pissed and declared that the pope declaration was invalid at the at the time but he eventually he walked that back came around and said is was okay for Tuscany to be a Grand Duchy.
So can the seventeen provinces be made into a Grand Duchy?
The Grand Duchy of Lotheir