Martin Luther King, Jr. Day is an American federal holiday that marks the birthday of Martin Luther King, Jr. It is observed on the third Monday of January, which is around Dr. King’s birthday, January 15. This year it is observed on January 18.
In his speech to Congress in September of 2015, Pope Francis lifted up four Americans who worked for social justice. They were two non-Catholics, Abraham Lincoln and Martin Luther King, Jr., and two Catholics, Dorothy Day and Thomas Merton. Crux columnist John L. Allen Jr. called them the pope’s “Fantastic Four” who stood up for the poor.