Nine letters written by Princess Diana shortly after her marriage to King Charles (then Prince Charles) are expected to fetch up to $25,000 at auction, the Daily Mail reports.

After their July 29, 1981 wedding, Prince Charles and Princess Diana returned from their two-week honeymoon on the royal yacht Britannia on August 12, just two days before the first letter was written. In a letter to the family's former housekeeper, Maud Pendry, Diana called the honeymoon a "great success" and wrote that she and Charles had a "glorious time" on their getaway. A fragment of the letter was featured in a documentary program, in which she recounts her confrontation with Charles about a pair of cufflinks given to her by Camilla Parker-Bowles.

"On our honeymoon, a pair of cufflinks arrived on his wrist. Two "C's" intertwined like the "C" in Chanel, one knew exactly what they were. 'You got them from Camilla, didn't you? 'It's a gift from a friend,' she said. And we got into a fight. Jealousy, total jealousy; it was a good idea, the two C's, but it wasn't that clever."

In her August 1981 letter to Pendry, however, there is no mention of this. Diana instead emphasizes the positive. 'I hope you weren't too tired after all the events of the wedding. 'The honeymoon was a great success and we had a wonderful time catching up on lost energy and sleep. We wanted you both to know how deeply touched we are by your thoughtfulness. Endless love and affection - Diana."

Prince Charles and Princess Diana's disagreement became apparent during their honeymoon, writes royal biographer Penny Juneau in her book The Duchess. Whereas Prince Charles wanted to swim, read, paint, and write thank-you notes, Diana wanted to spend time talking to her new husband. He took with him a watercolor, a canvas, and a stack of books by Afrikaner mystic and author Lawrence van der Post. But Diana was not a reader. She hated his awful books and resented the fact that he would rather bury his head in a book than sit and talk with her. She also resented the fact that he would sit at the easel for hours at a time, and they argued a lot. One day, while Charles was painting on Britannia's veranda deck, he went out to look at something for half an hour. When he returned, she had destroyed all his paintings and art supplies". Well, this is one way to start a marriage.

Other letters to Pendry reveal Diana's happiness with motherhood, including her desire for "more" babies after the birth of her first child, Prince William, on June 21, 1982." Enclosed is a photo of the very proud and lucky mother. Diana wrote from Balmoral Castle on September 8, 1982. (Somewhat eerily, exactly 40 years later, her mother-in-law, Queen Elizabeth, would pass away at that very location on that very day.) In that same letter, Diana wrote: "William has brought us so much happiness and contentment. We are staying in Scotland until the end of October.

Later, in a thank-you letter dated September 25, Diana wrote, "We are so thrilled and delighted with your wonderful cardigan. Thank you so much for spoiling William. It is so much more than he deserves. At the rate he is growing, it won't be long before he will look good in a cardigan. 0]

Two years later, still pregnant with Prince Harry, Diana was still happy, and she and Prince Charles were closest during her second pregnancy in 1984, Diana later said. 'Thank you so much for remembering us on our wedding anniversary,' she said. 'We were very touched by your cards. Unlike other couples, we both remembered this day and thought we were fortunate that three years had gone by so quickly. With a baby on the way, our lives are going to be very busy, but we can't think of anything else to do." Harry was born about seven weeks later, on September 15.

Another letter noted Diana's sense of humor and her fondness for Pendry and her husband and butler, Ainsley. She wrote, "The family seems to be growing and Sarah's baby is adorable, with very long fingers. I wanted you both to know that I must have seen someone from the Pendry family.

Diana's last two letters were written in 1986, the Daily Mail reported. 'I just wanted to say that I was so sad to hear about Mr. Pendry,' Diana wrote on Christmas Eve, December 24, after Ainslie's death. In a second letter written two years later, she wrote, "I can only imagine how empty you must feel when something like this happens...It was so nice of you to send us a nice card on our anniversary. We were thrilled to receive it and very touched by your thoughtfulness."

These letters first came to public attention 22 years ago when they were sold to hotelier Michael Rockall for £22,000 and displayed at Whittlebury Hall in Towcester, Northamptonshire. 'This is an amazingly exciting collection and we're over the moon to have bought it. 'The price was quite close to the level we wanted and we thought it might go abroad. I feel strongly that these should stay in England. I consider it a particularly personal collection, written to someone the Princess would have known personally for a long time."

In 2002, Princess Diana, who had passed away just five years earlier in a car accident in Paris in 1997, the collection, which also included 14 Christmas cards, signed photographs, and Charles and Diana's wedding invitation, eventually came into the possession of Jeff and Carol Sarjeant of They were to sell the collection through Julian's Auctions.

"This collection of letters, encompassing thank you letters, holiday greetings, and other correspondence, is a rare look at Diana's life beyond her carefully crafted public image. Written in Diana's own elegant script, the letters reveal her warmth and genuine concern for others." These letters reveal a woman who, despite her royal status, remained down-to-earth and appreciative of the people in her life, from her staff to her closest confidants."