Central protagonist. An Augustinian friar turned reformer who questions the Catholic Church's sale of indulgences and teaches that God is a God of love rather than vengeance. Posts the 95 Theses, faces excommunication and trial at Worms, refuses to recant, and hides in Wartburg Castle while translating the Bible into German.
Karlstadt's radical actions clash with Luther's more measured theological stance.
Katharina becomes Luther's wife and partner in building a family.
Frederick provides crucial political and physical protection to Luther.
Tetzel promotes indulgences while Luther actively opposes and critiques them.
Staupitz serves as Luther's monastic supervisor and spiritual mentor.
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