A strong HRE

What POD can you think of that makes the HRE retain a strong central authority? What effects will this have later?
 
France was just as weak and decentralised as the Holy Roman Empire was in the 11th century. Just have a powerful dynasty like the Hohenstaufens consolidate power like the Valois did, probably with a POD around 1100, 1200 at the latest.
 
Subjugate the pope and trounce the princes. The empire wasn't doomed to fall apart but it was certainly set to be weak, you need active leadership with enough military force to hold the empire down long enough that the power can maintain itself.
 
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