and recently. The Duke and Duchess of Sussex at Windsor Castle, and the lavish ceremony was watched by millions worldwide.

The ceremony and reception were attended by a long list of family, friends and celebrities.

While only 600 people witnessed their vows inside the chapel, one seat was left unoccupied, and now we know why. The empty seat was located right in front of the late Queen Elizabeth, who was sitting next to her husband, the late Prince Philip, and right next to Prince William.

While some reports at the time suggested that the seat was left open in memory of the late Princess Diana, Prince Harry's mother, the explanation proved to be more practical.

According to magazine, the seat was left unoccupied so the late monarch "had a perfectly clear view of the proceedings from the second row."

The same strategy was adopted a few months later for Princess Eugenie's wedding in October.

Elizabeth was seated in the second row alongside the Prince and Princess of Wales, King Charles and the newly married Duke and Duchess of Sussex.

This year, the Duchess of Sussex marked her seventh wedding anniversary by sharing a picture board consisting of snaps with her, Prince Harry, and their children from various moments of their life together.

Meghan's heartfelt post was captioned: "Seven years of marriage. A lifetime of stories. Thanks to all of you (whether by our side, or from afar) who have loved and supported us throughout our love story - we appreciate you. Happy anniversary! [red heart emoji]

Among the images were numerous pictures of Meghan and Harry embracing, and one of the duke tenderly cradling the head of one of their children as a swaddled newborn.