(1963) A letter that Martin Luther King, Jr., addressed to his fellow clergymen while he was in jail in Birmingham, Alabama, in 1963, after a nonviolent protest against racial segregation
(1963) A letter that Martin Luther King, Jr., addressed to his fellow clergymen while he was in jail in Birmingham, Alabama, in 1963, after a nonviolent protest against racial segregation
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He wasn't writing to Birgingham jail, he was writing from the
Birmingham jail, where he was being detained at the time, to his
"fellow clergymen" of Alabama.
To straight out answer your question, he was in Birmingham jail
when he wrote the letter in question (it's called "Letter From a
Birmingham Jail")
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Letter from Birmingham Jail was written on the 16th of April
1963