Martin Luther was a German theologian, preacher, translator, and hymn writer whose works helped shape the Protestant Reformation. Best known for his Ninety-Five Theses, his German Bible translation, and his Small Catechism, he brought questions of faith and religious authority to a broad readership. His direct, vigorous prose made complex theological arguments accessible beyond universities and monasteries.

Born in Eisleben, Luther studied at Erfurt before entering an Augustinian monastery and later teaching theology at Wittenberg. His challenge to the sale of indulgences in 1517 developed into a wider dispute with the Roman Catholic Church. While sheltered at the Wartburg, he translated the New Testament into German; the complete Bible followed in 1534. His translation became a major influence on German religious life and written language.

Published in 1529, Luther’s Small Catechism explained central Christian teachings through concise questions and answers intended for household instruction. Alongside the Large Catechism, sermons, theological treatises, and hymns such as “A Mighty Fortress Is Our God,” it reflects his concern with teaching and worship. His writings remain central to Lutheran tradition and to the study of the Reformation’s religious, educational, and literary legacy.