A trial was later held and became known as the Rivonia Trial. Mandela was on trial because of his involvement in sabotage and violence in 1962. He was sentenced to life in prison, and was sent to Robben Island, but was transferred to Victor Verster Prison in 1988. In 1990, he was let out of Victor Verster Prison after 26.5 years. He left prison after de Klerk removed a ban on the African National Congress. He ordered Mandela's release. He then received the Nobel Peace Prize in 1993, with former State President of South Africa, Frederik Willem de Klerk.