Martin Luther's 95 Theses sparked the Reformation, challenging the sale of indulgences and the doctrine of the treasury of merits. Luther's protest was initially against the agent of the church, Johann Tetzel, but eventually led to a broader critique of the Catholic Church. The theses were widely disseminated, thanks to the printing press, and Luther's ideas began to spread, leading to a series of important meetings and debates, including the Imperial Diet of Worms in 1521.
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