Prince William supported by his aunt Lady Sarah McCorquodale at military ceremony

Prince William, Prince of Wales attends the Sovereign's Parade on behalf of King Charles III at the Royal Air Force College in Cranwell
Prince William, Prince of Wales attends the Sovereign's Parade on behalf of King Charles III at the Royal Air Force College in Cranwell (Getty)

The Prince of Wales was joined by one of his royal relatives as he attended a military graduation on Thursday.

Lady Sarah McCorquodale, 69, a sister of the late Diana, Princess of Wales, joined Prince William, at RAF Cranwell on Thursday.

It's understood that Lady Sarah heard her nephew was at the event and turned up to show "support".

She lives 15 miles from the Air Academy, in Grantham, and she served a one-year term as High Sheriff of Lincolnshire in 2009. Spot Lady Sarah dressed in green behind William in the video below...

It comes just weeks after Prince William and Prince Harry attended the private funeral of their uncle, Lord Robert Fellowes, the husband of Diana's second older sister, Lady Jane Fellowes, in Norfolk.

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Harry discreetly flew into the UK from California and stayed with his uncle, Charles, 9th Earl Spencer at his late mother's childhood home, Althorp.

Lady Sarah McCorquodale
Lady Sarah McCorquodale pictured in 2013 (Getty)

William sported his summer bead with his Wing Commander uniform as he addressed the new RAF officers.

The RAF changed their policy around beards in 2019, having previously had much stricter regulations around facial hair.

Prince William, Prince of Wales inspects the Guard of Honour ahead of the Sovereign's Parade on behalf of King Charles III at the Royal Air Force College in Cranwell
Inspecting the Guard of Honour (Getty)

The engagement was a trip down memory lane as the Prince trained at the air force base and later received his wings from his father, then Prince Charles, during a ceremony at Cranwell in 2008, accompanied by his future wife, Kate.

William accompanied by Kate Middleton as he receives RAF Wings in 2008
William was joined by future wife Kate as he received his RAF Wings at RAF Cranwell in 2008 (Getty)

In his speech, William said: "We live in a time of change and uncertainty, and you, as the future of the Royal Air Force, are the ones who will ensure that we are able to adapt and face future threats."

During the graduation parade, he acknowledged the royal salute of the 54 new officers on the parade ground, who as cadets spent up to 24 weeks being taught about leadership, underwent strenuous military exercises and other training.

Britain's Prince William, Prince of Wales speaks with Parade Executives in the rotunda of the Royal Air Force (RAF) College in Cranwell
William spoke with cadets at the college (Getty)

He continued: "Whilst I didn't graduate on this exact parade ground, I did graduate from flying training here so I know something about the celebrations that will come later, so I promise, I'll only take a few minutes of your time!

"I do want to take this moment though, to highlight not only the importance of your achievements to date, but also that of the roles you will play in supporting the futures of your countries’ air forces.

William signing visitors book at RAF Cranwell
Signing the visitors' book (Getty)

"I say 'your countries', as I know that in addition to our newest Royal Air Force officers on parade today, there are also officers from Jordan, Kenya, Pakistan and Uganda.

"Multinational relationships are key to international defence, security, and peace.

"The relationships you have formed through training, will be key in allowing you to achieve success in future roles, and enhancing the security of all our nations."