"Nelson Mandela I'd never heard the name before in my life," a former prison guard to the South African icon recalls. Christo Brand casts his mind back to 1978, and his first night guarding one of the most influential people of the past century. He was just 19 years old. A sergeant informed him the ageing man sleeping uncomfortably on the floor of the Robben Island jail cell was "a terrorist trying to overthrow your country". Mr Brand ... soon became close with Mandela. He began to spend days and nights with Mandela, who he says remained charming even after some 16 years as prisoner 466/64. In time he saw virtue in the older man's crimes. Reflecting after years at Mandela's side, years in which he saw his friend slowly but surely topple the old order, Mr Brand says: "Mandela was fighting for the freedom of the country, he was prepared to go to the gallows for freedom for his people". "When Mandela was in prison," Mr Brand says, "he studied Martin Luther King and Gandhi, he tried to follow their footsteps and try to bring a change." In his memoir Long Walk to Freedom, Mandela hints at why he kept his prison officer at his side even after being freed. Mr Brand, he writes, "reinforced my belief in the essential humanity even of those who had kept me behind bars". Mandela emerged from prison in 1990 already negotiating with South Africa's leadership for the changes that would see the country's first democratic election a few years later.