The story of how Michael King Jr. became Martin Luther King Jr.

On his 90th birthday, the Washington Post takes a look at the civil rights leader’s childhood name change.

“It was a big deal for [King’s father] to go [Germany], to the birthplace of Protestantism,” said Carson, who edited “The Autobiography of Martin Luther King, Jr.,” which was compiled and written after King’s assassination. “That probably implanted the idea of changing his name to Martin Luther King.”