King Charles and his sister Princess Anne spent quality time with their 'trusted guardians' at Windsor Castle.
Following the event, the palace issued images accompanied by a poignant message from King Charles.
According to the statement, the King, Colonel in Chief of The Household Cavalry, and the Princess Royal, Colonel of The Blues and Royals, were present at Windsor Castle as new standards were presented to The Life Guards and the Blues and Royals.
The queen and Princess Royal attended the Household Cavalry's new Standards Parade at Windsor Castle.