It is a decade since the writer and human rights activist Ken Saro-Wiwa was executed in Nigeria despite worldwide pleas for clemency on 10 November 1995.

He tried to end the problems of the oil-producing Niger Delta. Focusing on his homeland, Ogoni, he started the community-based Movement for the Survival of the Ogoni People.

This grassroots movement had no real precedent in the corrupt politics of Nigeria - which was then under military rule. Many among the political class felt threatened.

He and eight colleagues were hanged after being found guilty of involvement in four murders. They say they were framed. Nigeria was subsequently expelled from the Commonwealth.

The activist had a troubled relationship with his son, Ken Wiwa, who wrote after his father's death that martyrs often sacrifice their children to make the world safe for them.

Ken Wiwa says he can never completely forget his father's long absences from his family and what he felt was the neglect of his mother, himself and his brothers and sisters.

But he reached a reconciliation with his jailed father through an exchange of letters and became increasingly politicised, especially after the 1992 death of his younger brother Tedum.

Before his death, Mr Saro-Wiwa's father, Pa Beesom, refused to meet a commission investigating the hangings. "There's no point," he said. "They cannot bring my son back."