In 1415, the Czech priest and and professor John Huss was tried, condemned and executed, burned at the stake, at the Council of Constance.
A little over a century later, in 1521, Martin Luther, an Augustinian friar, appeared before the young Emperor Charles V at the Diet of Worms. Luther reminded some people of Huss. Luther himself said that he agreed with some aspects of Huss' teachings. Some people assumed that Luther would be condemned and executed as Huss had been, and were surprised when, after Luther has stood trial before him, Charles allowed Luther to leave the council under the same safe conduct which had protected him on his way there.
And ever since, people have wondered why Charles let Luther go. Perhaps Charles, and/or his advisors, were thinking of the situation in Prague and the surrounding Czech territory: Huss had been executed, but the Hussite church was very much alive. Perhaps Charles wondered whether Huss might have had less influence if he had been tolerated, ignored, treated as a well-meaning simpleton.
I don't know why Luther was let go. Already in 1521 he was very popular, and the Lutheran church kept growing at an enormous pace. And, it seems to me, Luther was misunderstood from the start and is still misunderstood. For example, German peasants revolted in 1524 and 1525, and even a few nobles joined them. And these people in revolt called themselves Lutherans. As have many others to this day, they seem to have equated existing orders, and conservatism, with the Catholic Church, and Lutherism with all and any sort of protest or resistance to existing orders. "Protest --" it makes up the first two syllables of the word "Protestant."
Luther did not sympathize with the revolts. He wrote and published a tract in which he advised the nobles to crush the rebellion thoroughly, to torture and kill the rebels. And indeed, they did exactly that.
Would the powers that were have treated the rebels any differently if Luther had not said or written a word about the rebellion? I don't know. I tend to doubt it. I tend to doubt that this was one of Luther's most widely-read published works. Because people have not ceased to associate Catholicism with conservatism and Lutheranism with rebellion. Especially in Germany. Those who live in other parts of the world, and may be familiar with conservative Lutherans and Leftist Catholics, might be astonished, for example, to read, as I did, Schiller's history of the Dutch Revolution, where every imaginable sort of tyranny is associated with Catholicism, and every noble spirit of freedom with Protestantism, which in Germany meant Lutheranism. Except in painting and sculpture, where, Schiller said, it was all exactly reversed.
Schiller was an ignorant dingbat.
After the Diet of Worms, religious wars between Catholics and Protestants began, and did not cease for centuries. Luther condemned Lutheran peasants and championed Lutheran rulers, kings and dukes and counts.
Decades after Luther had passed away, in 1576, a 24-year-old Habsburg king and archduke became the Emperor Rudolf II, and ruled until 1612. I wonder what Luther would've thought of Rudolph. Like every other Habsburg ruler before and after him, Rudolph was Catholic. Unlike many other Habsburgs, Rudolf did not dislike, distrust or disapprove of non-Catholics. His court in Prague became a center of artistic and intellectual activity. He valued individuals according to the abilities, their talents; if he cared at all about their religious beliefs, he gave little sign of it.
A widespread belief about Rudolph at the time was that he was insane, and a very weak ruler, who did little to halt the gathering storm of religious conflict which exploded six years after his death at the beginning of the Thirty Years' War. This view also tended to dominate among historians, until just a few decades ago. Now, it seems, an entirely different view of Rudolph is the mainstream, that of a wise and tolerant ruler far ahead of his time, who did nothing at all to fan flames of war, and whom many of his contemporaries feared simply because he was far ahead of his time in his habits and thought. Not a lunatic, but an enlightened monarch a couple of centuries before the Enlightenment.
Who's right about Rudolph? Who's wrong? Or is everyone perhaps partly right and partly wrong? I don't know.
Around 1600, Ferdinand's court, widely thought of at the time as a madhouse, was visited by an orphaned teenage Czech noble who would also go on to divide opinion -- Albrecht von Wallenstein. Raised a Hussite, Wallenstein converted to Catholicism and served the Habsburgs as a military leader, and later also as a financier, until his death in 1634.
Or did he? This is the most controversial point. The conventional view, challenged by Golo Mann's biography of Wallenstein published in 1971, is that, in the last couple of years of his life, he began to conspire against the Emperor, while pretending to still be his loyal Generalissimo. Having been born a baron and risen, through his extraordinary talent as a military leader and statesman, to count, then marquise, then duke, he was accused of wanting to rise, at the Emperor's expense, still higher -- and the only ranks in 17th-century Europe higher than duke were king and -- Emperor.
Mann and others maintain that there simply is no serious evidence that Wallenstein was unloyal to the Habsburgs, and that his rising power was inconvenient to certain thoroughly dishonest and ruthless politicians, who turned the mind of the Emperor Ferdinand II (1619-1637) against one of his best helpers.
Who's right? I don't know.