Former first lady Graca Machel arrives for the funeral service of Archbishop Emeritus Desmond Tutu at St George's Cathedral in Cape Town, South Africa, January 1, 2022. REUTERS/Sumaya Hisham 

Graca Machel, former first lady of Mozambique and South Africa speaks during the opening session of the Future Investment Initiative Conference in Riyadh, Saudi Arabia, October 26, 2021. REUTERS/Ahmed Yosri 

Moderator, Princess Reema Al Saud, Ambassador of the Kingdom of Saudi Arabia to the U.S. speaks to Graca Machel, former first lady of Mozambique and South Africa, during the opening session of the Future Investment Initiative Conference in Riyadh, Saudi Arabia, October 26, 2021. REUTERS/Ahmed Yosri 

Moderator, Princess Reema Al Saud, Ambassador of the Kingdom of Saudi Arabia to the U.S. speaks to Graca Machel, former first lady of Mozambique and South Africa, during the opening session of the Future Investment Initiative Conference in Riyadh, Saudi Arabia, October 26, 2021. REUTERS/Ahmed Yosri 

Moderator, Princess Reema Al Saud, Ambassador of the Kingdom of Saudi Arabia to the U.S. speaks to Graca Machel, former first lady of Mozambique and South Africa, during the opening session of the Future Investment Initiative Conference in Riyadh, Saudi Arabia, October 26, 2021. REUTERS/Ahmed Yosri 

Graca Machel, former first lady of Mozambique and South Africa, speaks during the opening session of the Future Investment Initiative Conference in Riyadh, Saudi Arabia, October 26, 2021. REUTERS/Ahmed Yosri 

Moderator, Princess Reema?Al Saud, Ambassador of the Kingdom of Saudi Arabia to the U.S. speaks to Graca Machel, former first lady of Mozambique and South Africa, during the opening session of the Future Investment Initiative Conference in Riyadh, Saudi Arabia, October 26, 2021. REUTERS/Ahmed Yosri 

Nelson Mandela's widow Graca Machel listens as South Africa's President Cyril Ramaphosa speaks from the balcony where Nelson Mandela gave his first speech after his release from prison 30 years ago, in Cape Town, South Africa, February 11, 2020. REUTERS/Sumaya Hisham 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, arrive before meeting Graca Machel, the widow of the late Nelson Mandela, at the British High Commissioner's residence, Johannesburg, South Africa, October 2, 2019.REUTERS/Siphiwe Sibeko 

A woman records a video as Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, arrive to deliver a statement before meeting Graca Machel, the widow of the late Nelson Mandela, at the British High Commissioner's residence, Johannesburg, South Africa, October 2, 2019.REUTERS/Siphiwe Sibeko 

Britain's Prince Harry delivers a statement before meeting Graca Machel, the widow of the late Nelson Mandela, at the British High Commissioner's residence, Johannesburg, South Africa, October 2, 2019.REUTERS/Siphiwe Sibeko 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, arrive to deliver a statement before meeting Graca Machel, the widow of the late Nelson Mandela, at the British High Commissioner's residence, Johannesburg, South Africa, October 2, 2019.REUTERS/Siphiwe Sibeko 

Meghan, Duchess of Sussex, speaks with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, attends a meeting with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, arrive to meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, attends a meeting with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, smiles as she arrives to meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, smiles as she arrives to meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, walks with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, walks with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, walks with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, walks with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, shakes hands with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry, the Duke of Sussex, greets Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, shakes hands with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, shakes hands with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, shakes hands with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Meghan, Duchess of Sussex, speaks with Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool TPX IMAGES OF THE DAY 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Graca Machel, the widow of the late Nelson Mandela, waits to greet Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Graca Machel, the widow of the late Nelson Mandela, waits to greet Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Graca Machel, the widow of the late Nelson Mandela, waits to greet Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Britain's Prince Harry and his wife Meghan, the Duke and Duchess of Sussex, meet Graca Machel, the widow of the late Nelson Mandela, in Johannesburg, South Africa, October 2, 2019. REUTERS/Chris Jackson/Pool 

Graca Machel, member of the Elders speaks at the Nelson Mandela Peace Summit during the 73rd United Nations General Assembly in New York, U.S., September 24, 2018. REUTERS/Lucas Jackson 

Graca Machel, member of the Elders speaks at the Nelson Mandela Peace Summit during the 73rd United Nations General Assembly in New York, U.S., September 24, 2018. REUTERS/Lucas Jackson 

Graca Machel, member of the Elders speaks at the Nelson Mandela Peace Summit during the 73rd United Nations General Assembly in New York, U.S., September 24, 2018. REUTERS/Carlo Allegri 

Graca Machel, member of the Elders speaks at the Nelson Mandela Peace Summit during the 73rd United Nations General Assembly in New York, U.S., September 24, 2018. REUTERS/Lucas Jackson 

Former U.S. President Barack Obama is embraced by Nelson Mandela's widow Graca Machel after he to delivered the 16th Nelson Mandela annual lecture in Johannesburg, South Africa July 17, 2018. REUTERS/Siphiwe Sibeko 

Nelson Mandela's widow Graca Machel addresses crowds gathered to hear former U.S. President Barack Obama delivering the 16th Nelson Mandela annual lecture in Johannesburg, South Africa July 17, 2018. REUTERS/Siphiwe Sibeko 

Former U.S. President Barack Obama greets Nelson Mandela's widow Graca Machel as he arrives to deliver the 16th Nelson Mandela annual lecture in Johannesburg, South Africa July 17, 2018. REUTERS/Siphiwe Sibeko 

Nelson Mandela's widow Graca Machel waves to the crowds gathered to hear former U.S. President Barack Obama delivering the 16th Nelson Mandela annual lecture in Johannesburg, South Africa July 17, 2018. REUTERS/Siphiwe Sibeko