Born in Eisleben, Germany, in 1483, Martin Luther went on to become one of Western history’s most significant figures. Luther spent his early years in relative anonymity as a monk and scholar. But in 1517 Luther penned a document attacking the Catholic Church’s corrupt practice of selling “indulgences” to absolve sin. His “95 Theses,” which propounded two central beliefs—that the Bible is the central religious authority and that humans may reach salvation only by their faith and not by their deeds—was to spark the Protestant Reformation. Although these ideas had been advanced before, Martin Luther codified them at a moment in history ripe for religious reformation. The Catholic Church was ever after divided, and the Protestantism that soon emerged was shaped by Luther’s ideas. His writings changed the course of religious and cultural history in the West.