Holy Roman Emperor Frederick IV in 1519

On June 28, 1519, Charles I of Spain was elected the successor of his late grandfather, Holy Roman Emperor Maximilian I.
Charles became Holy Roman Emperor Charles V.

Frederick the Wise (1463-1525) was Elector of Saxony as Frederick III from 1486 to 1525.
Suppose Frederick the Wise is elected Holy Roman Emperor.
He becomes Holy Roman Emperor Frederick IV.
What happens then?
 
This could butterfly the death of Louis II at Mohacs in 1526,

Maybe, maybe not. The Habsburgs through the Austrian Hereditary Lands are a natural ally for Hungary-Bohemia against the Ottomans, since if the Ottomans would have managed to overrun Hungary, then they would have been next.

The Ottomans wouldn't change their offensives, when the Holy Roman Empire has another emperor, and Louis II will still defend his kingdom against those invaders.
 
Frederick the Wise died before the Battle of Mohacs.

He gets a six-year reign unless being emperor changes his lifespan. Frederick protected Luther as Elector, and would have done so as emperor. No Edict of Worms, and the Reformation could have got off to a faster start.

Charles (V) was still king of Spain and Duke of Burgundy; he and Francis I of France would still have been enemies and fought the same wars as in OTL. The Imperial election in 1525 would probably have been between the two of them.
 
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