Six handwritten notes sent by Princess Diana to the Buckingham Palace sold for thousands of pounds at an auction on Thursday.

Auction house Cheffins sold the letters, which were sent by Princess Di to Buckingham Palace head steward Cyril Dickman. Cheffins described Dickman as "a favorite of every member of the Royal Family," and she served the Palace for over half a century.

One letter Diana wrote about sons William and Harry sold for over £3,000—considerably over its estimated price of £400. "William adores his little brother and spends the entire time swamping Harry with an endless supply of hugs and kisses, hardly letting the parents near," Diana wrote in the letter dated September 20, 1984. "The reaction to one tiny person's birth has totally overwhelmed us and I can hardly breathe for the mass of flowers that are arriving here!"

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She continued to write to Dickman for years, and in one letter dated October 17, 1992, she wrote that her sons "are well and enjoying boarding school a lot, although Harry is constantly in trouble!" That particular letter was estimated to sell for £730 but went for a whopping £2,500.

According to the BBC, all the letters fetched £15,100 at auction.

"I think it's because these letters actually focus on her speaking to, or writing to, a friend, about her children and her iconoclasty of being a mother and not a royal princess necessarily," Cheffins auctioneer Luke Macdonald said, according to ABC News. "I think it comes over in a way that we can relate to."

From: Esquire US