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Nelson Mandela, by Archbishop Desmond Tutu

6 December 2013 Last updated at 00:24 GMT

In 2002 when the BBC was making a two-part portrait of Nelson Mandela, David Dimbleby carried out a series of interviews with those who knew him well.

Archbishop Desmond Tutu was the first black Anglican Dean of Johannesburg, then Head of the South African Council of Churches and later the first black Archbishop of Cape Town.

His role in the struggle against apartheid helped to win him the Nobel Peace Prize in 1984.

He talks about Mandela's transformation from "angry, young activist" to "magnanimous".