This weekend, Eastern State Penitentiary will honor Martin Luther King Jr. with a reading of his seminal text, "Letter from Birmingham Jail." King wrote the letter in April 1963 while incarcerated for demonstrating without a permit. "He was already well known among many, but few knew how intelligent he was, how articulate he was, how capable he was of making a case for the civil rights movement," said Temple historian David Farber. "With that letter, he really announced himself to the nation."