One year ago today, September 8, Queen Elizabeth II passed away at the age of 96, while residing in her private Scottish residence, Balmoral Castle (a place which made the monarch “most happy,” according to her granddaughter, Princess Beatrice). Now, on the anniversary of Queen Elizabeth II’s death, Prince William, 41, and his wife, Kate Middleton, 41, are honoring the late monarch with a service at St Davids Cathedral and a special tribute on social media.