This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Martin Luther posted his Ninety Five Theses on indulgences at Wittenberg on 31 October 1517, meant as an academic challenge but instead setting off a movement he could no longer contain. Rome excommunicated him in 1521, and the Diet of Worms outlawed him the same year, yet he survived under the protection of Elector Frederick the Wise of Saxony, going on to translate scripture into German and organise a reformed church on his own teaching of justification by faith alone rather than by works.
The movement acquired its first settled statement of doctrine in 1530, when the Augsburg Confession was presented to Emperor Charles V, laying out what Lutherans held and where they differed from Rome. Legal standing followed twenty five years later: the Peace of Augsburg in 1555 let each prince of the Holy Roman Empire choose Lutheranism or Catholicism for his own territory, ending decades of religious war within the empire by fixing the faith to political boundaries rather than resolving it by force.
What this changed for Christianity's spread was the creation, for the first time since the church's early centuries, of a legally protected alternative to Rome inside western Christendom's own heartland. Lutheranism became the established church across large stretches of northern and central Germany, a status secured not by winning the theological argument outright but by a political settlement that let the new faith stand on equal legal footing with the old.