Context: Roman Catholicism was the sole established religion in the Holy Roman Empire until the Reformation changed this drastically. In 1517, Martin Luther challenged the Catholic Church as he saw it as a corruption of Christian faith. Through this, he altered the course of European and world history and established Protestantism. The Thirty Years' War (1618–1648) was one of the most destructive conflicts in European history. The war was fought primarily in what is now Germany, and at various points involved most of the countries of Europe. The war was fought largely as a religious conflict between Protestants and Catholics in the Holy Roman Empire.

Question: In what year did Martin Luther challenge the Catholic Church?
Answer: 1517

Question: During what years was the thirty year war?
Answer: 1618–1648

Question: Until the Reformation, what was the established religion in Germany?
Answer: Roman Catholicism

Question: Where was the thirty year war primarily fought?
Answer: Germany

Question: Who was the thirty year war between?
Answer: Protestants and Catholics

Question: What was the sole religion in Europe until the reformation?
Answer: Unanswerable

Question: Who challenged the Catholic Church in the 15th century?
Answer: Unanswerable

Question: Who established Protestantism in the 15th century?
Answer: Unanswerable

Question: What religious war was fought in the 16th century?
Answer: Unanswerable