Kate Middleton had a special reunion at the latest Buckingham Palace garden party.

At the royal event on Tuesday, May 20, the Princess of Wales shared a warm embrace with Steven Frank, a man originally from Amsterdam who lived through multiple concentration camps as a child. Kate, 43, photographed Frank with his then-teenaged granddaughters, Maggie and Trixie Fleet, five years ago for a project marking the 75th anniversary of the end of World War II.

The royal said at the time, “The harrowing atrocities of the Holocaust, which were caused by the most unthinkable evil, will forever lay heavy in our hearts. Yet it is so often through the most unimaginable adversity that the most remarkable people flourish.”

“They look back on their experiences with sadness but also with gratitude that they were some of the lucky few to make it through. Their stories will stay with me forever,” she said of the experience. “Whilst I have been lucky enough to meet two of the now very few survivors, I recognize not everyone in the future will be able to hear these stories firsthand. It is vital that their memories are preserved and passed on to future generations, so that what they went through will never be forgotten.”