Lord Robert Fellowes, a close advisor to Queen Elizabeth and Princess Diana, has died at the age of 82. He was closely associated with the British Royal Family and was Prince William and Prince Harry’s uncle. Fellowers was married to the late Princess Diana’s sister, Lady Jane Spencer. The couple has three children together: Alexander, Eleanor, and Laura.

Lord Fellowes was the late Queen’s private secretary during the 1990s, an era defined by severe obstacles, notably Princess Diana’s divorce from then-Prince Charles. It was also the end of Fergie and Prince Andrew’s marriage, as well as Princess Anne’s divorce from Mark Phillips. He was extensively involved in resolving the problem caused by the fire at Windsor Castle in 1992, which damaged 115 rooms.

Lord Fellowes held the position when his sister-in-law, Princess Diana, died in a tragic car accident in Paris while attempting to flee the paparazzi. She and her partner Dodi Fayed, the son of Egyptian billionaire Mohamed Al-Fayed, her driver Henri Paul, and her bodyguard Trevor Rees-Jones crashed the Mercedes in the Pont de I’Alma tunnel.

Following Diana Dodi Fayed’s death, Lord Fellowes vigorously disputed charges made by Mohamed Al Fayed, Dodi’s father and Harrods owner, who claimed Fellowes was involved in a conspiracy to murder the pair. Lord Fellowes died on July 29 of unidentified circumstances, according to The Times. Lady Di’s brother, Charles Spencer, paid tribute to his brother-in-law on social media.

“My absolutely exceptional brother-in-law, Robert, is no longer with us,” he posted on Facebook. “A total gentleman in all the best senses of the word, he was a guy of humor, wisdom, and unwavering integrity. I’m quite proud to have been his brother-in-law. Lord Fellowes’ father, Sir William “Billy” Fellowes, worked as a land agent at the Royal Family’s Sandringham Estate for 30 years. Interestingly, it was also where Lord Fellowes was born. “Robert is the only one of my private secretaries I have held in my arms,” the late Queen Elizabeth once told The Times.