The King has offered condolences to Anne Frank's step-sister and survivor of the Holocaust Eva Schloss, who has died at the age of 96.
"My wife and I are greatly saddened to hear of the passing of Eva Schloss," wrote the King in a tribute shared via social media.
He continued, "The horrors that she endured as a young woman are impossible to comprehend and yet she dedicated the rest of her life to overcoming hatred and prejudice, promoting kindness, courage, understanding and resilience."
Mrs Schloss was the founding member and honorary head of the Anne Frank Trust, an organization where the Queen Consort serves as Royal Patron.
In the 1940s, Mrs Schloss and her family were chased from their home in Austria. They lived as refugees in the Netherlands before being captured and deported to the notorious Auschwitz concentration camp.
The Anne Frank Trust said Mrs Schloss died in London on 3 January. "In her youth, Eva Schloss-Geiringer lived in Amsterdam, opposite Anne Frank's home," the trust stated.
When Mrs Schloss and her mother were liberated by the Red Army in January 1945, they were clinging to life. Her father and brother both died in captivity.
After being returned to Amsterdam, her mother Elfriede—known as Fritzi—wed Otto Frank, the father of Anne Frank, who had also managed to survive imprisonment by the Nazis.
Over the past four decades, Mrs Schloss dedicated her life to trying to stop history from happening again.
"I worked very, very hard to alter people's attitudes," Mrs Schloss remarked in an interview. "Every individual you persuade not to be racist is a positive."
In 1951, Mrs Schloss moved to London to learn photography. There she met her husband, Zvi Schloss, a German Jew who had escaped to Palestine during the war.
The couple settled in London and became UK citizens. Mr Schloss died in London in 2016. They are remembered by their daughters, sons-in-law and grandchildren.