A year after the death of former president Nelson Mandela, South Africans have been remembering the man who led their country out of apartheid.

At an official ceremony held in Pretoria, Mandela’s widow Graça Machel urged her countrymen and women to carry on her husband’s legacy.

“Why today we honor his life? It’s up to each one of us, as he clearly said it on this 90th birthday: it is in the hands of each one of us to take what is your stake, to close the divisions which are still within us,” she said.

A weekend of commemorative events is planned including three minutes and seven seconds of bells and horn sounding, followed by three minutes silence to represent Mandela’s 67 years of public service.