This Day In History: April 18

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Martin Luther, the chief catalyst of Protestantism, defies the Holy Roman Emperor Charles V by his writings. He had been called to Worms, Germany, to appear before the Diet (assembly) of the Holy Roman Empire and answer charges of heresy. His response, known as the "Here I Stand" speech, would go down as one of the greatest pieces of oratory in world history.

"My conscience is captive to the word of God! To go against conscience is neither right nor safe," Luther asserted. "I therefore cannot, and I will not recant! Here I stand. I can do no other."

Martin Luther was a professor of biblical interpretation at the University of Wittenberg in Germany. In 1517, he drew up his 95 theses condemning the Catholic Church for its corrupt practice of selling “indulgences,” or forgiveness of sins. Luther followed up the revolutionary work with equally controversial and groundbreaking theological works, and his fiery words set off religious reformers across Europe.

In 1521, the pope excommunicated him, and he was called to appear before the emperor at the Diet of Worms to defend his beliefs. Refusing to recant or rescind his positions, Luther was declared an outlaw and a heretic. Powerful German princes protected him, however, and by his death in 1546 his ideas had significantly altered the course of Western thought.