We already knew that Princess Diana's brother, Charles Spencer, is a big history buff. The 9th Earl Spencer has published a number of titles that analyze British history, one of which just became a #1 bestseller on Amazon. And when it comes to his family history, the royal is just as diligent about searching for facts.

A couple months ago, Spencer revealed how his ancestors' connections to the royal family go much further back than when the late Princess of Wales married Prince Charles. In fact, the earl found an unearthed snapshot, where his grandfather was seen showing Queen Elizabeth's grandmother, Queen Mary, around Sulgrave Manor.

But that's not all. Now, it looks like Spencer has discovered even more connections between the two bloodlines. The earl shared a photo of three of his family members, with a caption that said, “My grandfather, great aunt and great uncle - Jack, Lavinia and Cecil Spencer - setting off for a fancy dress party in 1902.”

The 9th Earl Spencer revealed a special connection to the royal family, saying, “Lavinia married a local aristocrat, and served the late Queen Mother as a Lady In Waiting, when the Queen Mother was Duchess of York: she and Lavinia were childhood friends.”

He went on to further explain the history of the photographed members, saying, “Lavinia’s son Lukie played cricket for England a couple of times. She was a chain smoker, and died in her mid-50s. Cecil (who, like me, was born on 20 May) won a chestful of medals as a Motor Torpedo Boat captain in World War 1, and died aged 33 after being thrown from his polo pony.”

Spencer also disclosed how he came across such a rare photograph, writing, “I’ve today bought this trio’s baby brother George’s diary, written between 1918-20, and this is one of the photographs of his siblings that I found in the back part of it. This photograph was taken at Dallington House, near @althorphouse.”

We love learning more and more about the connections between these two families.

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RELATED: This Rare Childhood Photo of Princess Diana Will Make You Do a Double Take

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