Prince William made Princess Diana a promise before she died. He is pictured during a visit to Pall Mall Barbers in London on Feb. 14, 2019. Kirsty Wigglesworth/AFP/Getty Images

Princess Diana was stripped of her title as HRH following her divorce from Prince Charles in 1996, but a new report claims the late royal was told she would eventually get that title back—by her oldest son, Prince William.

In the documentary “Prince William: Royalty In My Family,” it is revealed that after Diana was forced to give up the HRH honorific following her 1996 divorce and given the new title of Diana, Princess of Wales, Prince William stated he would eventually bestow that title on her once again.

“It’s believed that William later advised her to accelerate her divorce proceedings by agreeing to be stripped of her royal title,” the documentary claims.

However, he later comforted her by saying he would find a way to get that title back to her later on in life, promising his mother he would bestow the title on her once again when he became king one day.

Unfortunately, William was not given the chance, as his mother died in a car crash one year after.

Though Prince William may have wanted to give his mother back her title, it’s also recently been reported that the reason his wife, Kate Middleton, and Prince Harry’s wife, Meghan Markle, are not referred to as princesses is because their father’s second wife, Camilla Parker-Bowles, deferred from the title of Princess of Wales after their marriage out of respect for Diana’s memory.

With Camilla’s reported decision to take on the title of Duchess of Cornwall reportedly led to the title of duchess to become an official one within the more senior members of the royal family. Because of her decision, Kate became the Duchess of Cambridge upon her marriage, while Meghan became the Duchess of Sussex.