George Bizos was part of the legal defence team which represented Nelson Mandela and other ANC leaders at the Rivonia treason trial in 1964 which sentenced him to prison on Robben Island.
He first met Mandela in the 1950s and remains a close friend to this day.
Mr Bizos explains why he suggested a late amendment to Mandela's famous speech which he delivered before being sentenced.
You can watch the full interview on Tuesday 11 October on BBC World News at 03:30 GMT, 08:30 GMT, 15:30 GMT and 20:30 GMT.
And on BBC News Channel on Tuesday 11 October at 04.30 and on Wednesday October 12 at 00:30 BST.
Find out who is coming up on the programme by following us on