Charles and Camilla, the Duchess of Cornwall, also paid tribute to the “stories of tragedy, loss and suffering”.
The Duke added: “As I speak, the last generation of living witnesses is tragically passing from this world, so the task of bearing witness falls to us.
“That is why The Holocaust Memorial Day Trust, of which I am so proud to be Patron, has this year chosen the theme – ‘Be the Light in the Darkness’.
“This is not a task for one time only; nor is it a task for one generation, or one person. It is for all people, all generations, and all time.
“This is our time when we can, each in our own way, be the light that ensures the darkness can never return.”