Martin Luther (10 November 1483 – 18 February 1546) was a German monk, priest, professor of theology and iconic figure of the Protestant Reformation. He strongly disputed the claim that freedom from God's punishment for sin could be purchased with money. He confronted indulgence salesman Johann Tetzel with his Ninety-Five Theses in 1517. His theology challenged the authority and office of the Pope by teaching that the Bible is the only source of divinely revealed knowledge from God.
A Mighty Fortress Is Our God (German, Ein feste Burg ist unser Gott) is one of the best known of Martin Luthers hymns. Luther wrote the words and composed the melody sometime between 1527 and 1529. It has been translated into English over seventy times and also into many other languages. The words are a paraphrase of Psalm 46. This rare, early printing is from 1533. Martin Luther was a prolific writer and hymnist.