Prince Harry has revealed he has a touching picture of his mum Diana meeting Nelson Mandela on his wall.
The Duke of Sussex said he treasures the image of his mother with the former South African President.
Princess Diana met the anti-apartheid hero in Cape Town, South Africa, just three months before her death in August 1997.
Prince Harry observed his mother's "cheekiness" in the image as he paid tribute to Mandela during a speech at the UN headquarters in New York.
The royal said: "On my wall and in my heart every day is an image of my mother and Mandela meeting in Cape Town in 1997.
"The photo was presented to me by the late Archbishop Desmond Tutu. When I first looked at the photo straight away what jumped out was the joy on my mother's face, the playfulness, cheekiness even.
"The pure delight to be in communion with another soul so committed to serving humanity.
"And then I looked at Mandela, here was a man with the weight of the world on his shoulders.
"Yet in that photo and so many others he's still beaming, still able to see the goodness in humanity, still buoyant with a beautiful spirit that lifted everyone around him."
Harry delivered the keynote speech as part of a series of addresses at the UN celebrating Nelson Mandela International Day.
Princess Diana was pictured shaking Mandela's hand outside his presidential residence in May 1997.
Harry's mum spoke to the President about the battle against Aids during her visit.
Following her death, Mandela paid tribute to Diana, describing her as "one of the best ambassadors of Great Britain".
He said: "I had the honour of hosting her a few months ago and was tremendously impressed by her.
"She was undoubtedly one of the best ambassadors of Great Britain. I found her very graceful, highly intelligent and committed to worthy causes."
During his speech today, the Duke of Sussex said he was inspired by Mandela's ability to keep smiling in the face of cruelty and injustice.
The royal also called for global leaders to take action on climate change, warning "our world is on fire ".
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He said: "The Horn of Africa is enduring the longest drought it's faced in close to half a century.
"And what's happening in Africa is not an isolated event. The drought there is a reflection of extreme weather we are seeing across the world.
"As we sit here today our world is on fire, again. These historic weather events are no longer historic.
"This crisis will only grow worse unless our leaders lead."
