Parker, Geoffrey. "Martin Luther Burns at the Stake, 1521"
Divergence: 1521 CE
What if: The Emperor Charles had not protected Luther at the Diet of Worms.
Summary: Essay speculating that the though the Reformation would have been weakened, it nevertheless was going to happen. But it might also have occurred within the Catholic church rather tahn without.
Published: In What If? 2: Eminent Historians Imagine What Might Have Been (ed. Robert Cowley), q.v.