Prince Harry and Meghan Markle stepped out in London overnight, attending an exhibition celebrating the life of South African revolutionary Nelson Mandela.

The couple shone a spotlight on the exhibition on what would have been Mandela’s 100th birthday, and even met his granddaughter Zamaswazi Dlamini-Mandela (below, in red).

The moment was undoubtedly sentimental for the couple, since Harry’s mother Princess Diana was a huge admirer of Mandela. Diana met President Mandela in March 1997 while on a visit to Cape Town, just five months before her death.

“She will be sadly missed as a warm, compassionate and caring person,” Mandela said at the time of Diana’s death.

“I vividly recall our meeting when she visited South Africa last year and her burning desire to assist HIV positive children in Africa. Princess Diana had indeed become an Ambassador for victims of landmines, war orphans, the sick and needy throughout the world.”

In 2015 Harry visited the Nelson Mandela Foundation Centre of Memory in South Africa, and saw a portrait of his mother with Mandela during a tour of the archives.

Meghan looked classic in a blush trench coat and matching heels as she and Harry wandered through the exhibition, which is being held at London’s Southbank Centre.