NBC News — South African leader Nelson Mandela is celebrating his 93rd birthday. Mandela had a pre birthday celebration with family and friends sunday. In honor of Mandela's birthday, monday is United Nations Nelson Mandela International Day for freedom, justice and democracy.
Mandela was South Africa's first post apartheid president. He spent 27 years in prison after being convicted of sabotage and attempts to overthrow the government. He was released in 1990 and became president in 1994.