That's today.This is what the Writer's Almanac has to say:

It's the birthday of the Reverend Dr. Martin Luther King Jr., (books by this author) born in Atlanta (1929). It was 1955, early in King's new tenure as pastor of the Dexter Avenue Baptist Church in Montgomery, Alabama, that Rosa Parks refused to give up her seat on one of that city's busses. King was elected to lead the Montgomery Improvement Association, which was formed with the intention of boycotting the transit system. He was young — only 26 — and he knew his family connections and professional standing would help him find another pastorate should the boycott fail, so he accepted.

In his first speech to the group as its president of that organization, King said: "We have no alternative but to protest. For many years we have shown an amazing patience. We have sometimes given our white brothers the feeling that we liked the way we were being treated. But we come here tonight to be saved from that patience that makes us patient with anything less than freedom and justice."

The boycott worked, and King saw the opportunity for more change. He formed the Southern Christian Leadership Conference, which provided him a national platform. For the next 13 years, King worked to peacefully end segregation. In 1963, he joined other civil rights leaders in the March on Washington — that's where he gave his famous "I Have a Dream" speech.

Here's a link to the speech.