Martin Luther King, Jr. (January 15, 1929 – April 4, 1968) was an American clergyman, activist, and prominent leader in the African-American Civil Rights Movement. He is best known for his role in the advancement of civil rights in the United States and around the world, using nonviolent methods following the teachings of Mohandas Karamchand Gandhi. King has become a national icon in the history of modern American liberalism.

A Baptist minister, King became a civil rights activist early in his career. He led the 1955 Montgomery Bus Boycott and helped found the Southern Christian Leadership Conference (SCLC) in 1957, serving as its first president. King's efforts led to the 1963 March on Washington, where King delivered his "I Have a Dream" speech. There, he established his reputation as one of the greatest orators in American history.

In 1964, King became the youngest person to receive the Nobel Peace Prize for his work to end racial segregation and racial discrimination through civil disobedience and other nonviolent means. By the time of his death in 1968, he had refocused his efforts on ending poverty and stopping the Vietnam War.

 Martin Luther (help·info) (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 refusal to retract all of his writings at the demand of Pope Leo X in 1520 and the Holy Roman Emperor Charles V at the Diet of Worms in 1521 resulted in his excommunication by the pope and condemnation as an outlaw by the Emperor.

Luther taught that salvation is not earned by good deeds but received only as a free gift of God's grace through faith in Jesus Christ as redeemer from sin. His theology challenged the authority of the Pope of the Roman Catholic Church by teaching that the Bible is the only source of divinely revealed knowledge and opposed sacerdotalism by considering all baptized Christians to be a holy priesthood. Those who identify with Luther's teachings are called Lutherans.