Royal fans claimed to have seen strong similarities between Prince George and one of his distant relatives in a throwback picture shared on social media.

Prince George looks like a lesser-known family member in unearthed photo (Image: Getty)

A throwback black and white snap shared by Prince George’s great-uncle shows strong similarities between the young royal and a distant family member.

Charles Spencer, 60, took to Instagram to share an old image of his father in military uniform in the 1950s. He accompanied the photo with the caption: “My father, in military mode, 70 years ago. #scotsgreys #royalscotsgreys #1950s #blackandwhitephotography.”

Eagle-eyed royal fans have expressed their surprise at how George, 11, looks very much like his great-grandfather, John Spencer.

One Instagram user wrote: “Prince George looks a lot like him”. Another social media user agreed, adding, “Wow in this picture he really does”.

Another commented: “Wow I see a mix of Harry and William in him. Prince George also looks a lot like him.”

Other royal fans appreciated the historical significance of the photograph. One wrote on Instagram: “A poignant memory in the history of your life… So lovely. Thank you for sharing.”

Another wrote: “What a treasure, to have those pictures. I wish my family had pictures such as those.”

The younger brother of the late Princess Diana lives at Althorp House, the family home where he grew up. Last week, Earl Spencer also shared a touching tribute to his brother-in-law, Lord Robert Fellowes, who died at the age of 82. Lord Fellowes married Charles’ sister Jane in 1978.

Charles wrote on social media: “My absolutely exceptional brother-in-law, Robert, is no longer with us. A total gentleman—in all the best meanings of that word—he was a man of humor, wisdom, and utter integrity. I’m deeply proud to have been his brother-in-law.”

Prince George of Wales looks on ahead of the Spain vs England Euro final (Image: Getty Images)

Fans also think Prince William has a resemblance to the lesser-known royal (Image: Getty Images)#

Robert was one of the late Queen Elizabeth II’s courtiers, navigating her through her “annus horribilis” in 1992, when three of her children divorced, and when a fire broke out at Windsor Castle gutting more than 100 rooms.

The late Queen addressed her year publicly in a speech at Guildhall to mark the 40th anniversary of her accession to the throne.

She said: “1992 is not a year on which I shall look back with undiluted pleasure.

“In the words of one of my more sympathetic correspondents, it has turned out to be an ‘Annus Horribilis’.”