Teachings of Martin Luther emphasizing the cardinal doctrine of justification by faith alone WordNet 3.0 & Open English WordNet

Lutheranism is a major branch of Protestantism, identifying primarily with the theology of Martin Luther, the 16th-century German monk and reformer whose efforts to reform the theology and practices of the Catholic Church launched the Protestant Reformation. Wikipedia

One of the largest branches of Protestantism Wikipedia Disambiguation

The Christian denomination based on the beliefs and doctrines developed by Martin Luther and his immediate followers. Wiktionary

Branch of Christianity developed by Martin Luther. Wiktionary (translation)