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?