The message was accompanied by a picture taken in July 2020, during Prince Philip last-ever royal engagement.
Despite having retired from public office in August 2017, Prince Philip stepped out in the Quadrangle at Windsor Castle to carry out one last duty.
On the occasion, the late Duke of Edinburgh passed on his honorary title of Colonel-in-Chief of the Rifles regiment to Camilla.
Prince Philip was born on the Greek island of Corfu on this day in 1921.
While serving in the Navy, he married the Queen in November 1947.
The untimely death of King George VI five years later and the accession to the throne of his wife pushed the Duke of Edinburgh to leave the Navy and dedicate his life to the Crown and supporting the Queen.
By the time he retired, he had carried out more than 20,000 solo engagements and dozens of royal tours.
His legacy includes the creation of the Duke of Edinburgh Award scheme which, following its creation in 1956, has since expanded to 144 nations.
READ MORE: Lady Louise Windsor: Sophie reveals daughter’s grief at Philip loss
Prince Philip died during the morning of April 9 at Windsor Castle, where he had spent the most part of the coronavirus pandemic with the Queen.
Following his death, Prince Charles automatically inherited Philip’s title of Duke of Edinburgh.
However, as it was announced upon the nuptials of the Earl and Countess of Wessex, this title will be passed on to Prince Edward, who has been working closely with his father on the Duke of Edinburgh Award for years, when the Prince of Wales becomes King.
The Queen has also marked this poignant day by planting a rose named after the Duke.
MORE TO FOLLOW