It has been installed on Bloomsbury Central Baptist Church, Shaftesbury Avenue, where Dr King spoke in 1961.

He made a flying visit to the capital two years before his iconic “I have a dream” speech.

Camden Council and the Nubian Jak Community Trust collaborated on the plaque, which is also the first to be put on a place of worship.

The 1961 sermon urged people to live lives of “equal length, breadth, and height”.

A “long” life was one where a person’s talents are developed to the full, a “broad” life had a concern for the welfare of others, and a life of “height” recognised the need for God as the pinnacle of a complete life.

Martin Luther King was one of the most prominent leaders in the civil rights movement from 1955 until his assassination in 1968.