Walter Max Ulyate Sisulu (1912 -- 2003) – Walter Sisulu (right) is among the most respected leaders of the freedom movement in South Africa. The former ANC secretary-general was, like Mandela, jailed at Robben Island, where he served more than 25 years. In this photo, Sisulu is seated with Nelson Mandela (c), his then-wife Winnie (l), and Sisulu's wife Albertina (2nd-r), at a rally to celebrate Mandela's release from jail in 1990.
Desmond Tutu (1931) – Archbishop emeritus Desmond Tutu is a beloved South African icon who was awarded the Nobel Peace Prize in 1984 for his efforts to end and heal the wounds of apartheid. He later chaired South Africa's reconciliation commission to examine apartheid-era crimes. In 2007 he co-founded the Elders, a group of elder statesmen from around the world that works to solve global problems.
Oliver Tambo (1917 -- 1993) – Oliver Tambo, an exiled politician and activist against apartheid, became President of the African National Congress (ANC) in 1958. Later, Tambo was sent abroad by the ANC to mobilise opposition to apartheid. He returned to South Africa in 1991 after having spent over 30 years in exile and was elected National Chairperson of the ANC in July 1991. Mandela thanked Tambo in his speech when he was released from prison.
Robert Sobukwe (1924 -- 1978) – Robert Sobukwe (left) was a nationalist leader who left the African National Congress to found and head the Pan-Africanist Congress in 1959. One year later, he was arrested and moved to Robben Island where he was kept in solitary confinement. Sobukwe was released from prison in 1969 but was put under house arrest. He died in 1978 from lung complications but remains to this day a celebrated figure in the fight against apartheid.