The historic animosity and struggle between the Pope and the Holy Roman Emperor is a famous one, a struggle that often included having the Emperor create a new Pope as a puppet, and the old Pope humiliating or excommunicating the Emperor.
With that said, the Protestant Reformation seemed like a near perfect out for the Emperors, no longer having their will being bent by Rome, they could answer to God alone. But, there was that 1 in a hundred chance that an Emperor who decided to be more friendly to Rome came to power, and as it happened the Pope-friendly Charles V came to the throne just in time for that to happen.
So, what would happen if the Emperor (or any other possible Emperor) had converted to Protestantism?
With that said, the Protestant Reformation seemed like a near perfect out for the Emperors, no longer having their will being bent by Rome, they could answer to God alone. But, there was that 1 in a hundred chance that an Emperor who decided to be more friendly to Rome came to power, and as it happened the Pope-friendly Charles V came to the throne just in time for that to happen.
So, what would happen if the Emperor (or any other possible Emperor) had converted to Protestantism?