Martin Luther was a religious reformer who protested against the Catholic Church's practices and corruption. He studied religious texts deeply and developed his communication skills. Luther began campaigning against the Church's beliefs, selling of indulgences, and control over accessing God. This led the pope to order Luther's arrest. At his trial, Luther refused to renounce his writings and was almost burned at the stake. However, his ideas gained widespread popularity and support from the masses, leading to the beginning of the Protestant Reformation and reform of Christianity.