The Nobel Peace Prize 1993 was awarded jointly to Nelson Mandela and Frederik Willem de Klerk "for their work for the peaceful termination of the apartheid regime, and for laying the foundations for a new democratic South Africa." From their different points of departure, Mandela and de Klerk reached agreement on the principles for a transition to a new political order based on the tenet of one man-one vote.
According to the Nobel Committee, ethnic disparities cause the bitterest conflicts. South Africa has been the symbol of racially-conditioned suppression. Mandela’s and de Klerk’s constructive policy of peace and reconciliation led the way to the peaceful resolution of similar deep-rooted conflicts elsewhere in the world.
Here is an article on Nelson Mandela and Frederik Willem de Klerk's apartheid movement.