Luther’s frustration with this practice led him to write the 95 Theses, which were quickly snapped up, translated from Latin into German and distributed widely. A copy made its way to Rome, and efforts began to convince Luther to change his tune. He refused to keep silent, however, and in 1521 Pope Leo X formally excommunicated Luther from the Catholic Church. That same year, Luther again refused to recant his writings before the Holy Roman Emperor Charles V of Germany, who issued the famous Edict of Worms declaring Luther an outlaw and a heretic and giving permission for anyone to kill him without consequence. Protected by Prince Frederick, Luther began working on a German translation of the Bible, a task that took 10 years to complete.
The term “Protestant” first appeared in 1529, when Charles V revoked a provision that allowed the ruler of each German state to choose whether they would enforce the Edict of Worms. A number of princes and other supporters of Luther issued a protest, declaring that their allegiance to God trumped their allegiance to the emperor. They became known to their opponents as Protestants; gradually this name came to apply to all who believed the Church should be reformed, even those outside Germany. By the time Luther died, of natural causes, in 1546, his revolutionary beliefs had formed the basis for the Protestant Reformation, which would over the next three centuries revolutionize Western civilization.
– History.com Staff