You may have seen a few less recognised faces among the Cambridges, Princess Anne, and Prince Charles as the working royals gathered on Buckingham Palace's balcony alongside the Queen following the special Platinum Jubilee Trooping the Colour.
Prince Edward, Duke of Kent, was one of them.
In actuality, the Duke of Edinburgh assumed Prince Philip's position on the balcony, standing alongside Queen Elizabeth II in his military dress before the official flyover and before family members joined them.
If you don't know who Prince Edward is, here's everything you need to know about one of the monarch's closest relatives.
What is the Duke of Kent's title?
Princess Marina and Prince George, Duke of Kent, have a son named Prince Edward.
After his father died in a wartime aviation accident in 1942, he inherited the title of Duke of Kent at the age of seven.
Princess Alexandra, The Honourable Lady Ogilvy, 85, and Prince Michael of Kent, 79, are his younger siblings.
The Duke and Duchess of Kent have three children: George Windsor, Earl of St Andrews, 59, Lady Helen Taylor, 58, and Lord Nicholas Windsor, 51.
The duke and his wife currently reside at Wren House in Kensington Palace.
After finishing his education at Eton and Le Rosey School in Switzerland, he atteneded the Royal Military Academy at Sandhurst
The duke served in the military for more than 20 years and frequently carries out engagements on the Queen’s behalf.
Following Prince Philip’s retirement from public duties in 2017, the Duke of Kent has appeared at the Queen’s side at many events – the pair are said to be very close.
What is the Duke of Kent's age?
The Duke of Edinburgh was born on October 9, 1935, making him 86 years old - a decade younger than the Queen.
Her Majesty and Prince Edward have known each other since childhood.
What is the Queen's relationship with the Duke of Kent?
The Duke of Kent and the Queen are linked in two ways, which is confusing.
The duke and the Queen are not only first cousins because their fathers are brothers, but they are also related through Prince Edward's mother, Princess Marina.
Marina was the late Duke of Edinburgh's first cousin, making him cousins with Marina, who held the titles of Princess of Greece and Denmark before marrying and accepting the title of Duchess of Kent.