De Klerk chides South African government at Nobel summit Frederik de Klerk, the former South African president who won the Nobel Peace Prize in 1993 along with Nelson Mandela in recognition of their work for the peaceful termination of the apartheid regime, is among those attending the three-day World Summit of Nobel Peace Laureates in Warsaw. De Klerk accused the South African government of failing to honour Nelson Mandela's call for reconciliation. Images and soundbites.