Lord Robert Fellowes, the 82-year-old uncle by marriage to Prince William and Prince Harry, has passed away.

Lord Fellowes was married to Lady Jane Fellowes, the sister of the late Princess Diana. He served as Queen Elizabeth II’s private secretary from 1990 to 1999 and passed away on July 29. The cause of his death has not been disclosed, and funeral arrangements have yet to be announced.

During his tenure as private secretary, Lord Fellowes played a crucial role in advising the Queen on significant issues, including the divorces of her children and the tragic death of Princess Diana in 1997.

Married to Lady Jane Fellowes for 46 years, Lord Fellowes had three children: Alexander Robert, 41, Eleanor Ruth, 38, and Laura Jane, 44, who is the godmother to Princess Charlotte. Princess Diana was a bridesmaid at their wedding in 1978.

In 1986, Lord Fellowes was appointed deputy private secretary at Buckingham Palace and became the Queen’s private secretary four years later, succeeding Sir William Heseltine. He left the role in February 1999 to return to the private sector, becoming a banker. That same year, he was granted the title of Baron Fellowes of Shotesham in Norfolk as part of the Queen’s Birthday Honors List.

Lord Fellowes also served as a Crossbench Peer in the House of Lords, remaining non-affiliated with any political party until his retirement in 2022. Even after leaving his official position, he remained connected to the royal family as an extra equerry to the Queen until her death in September 2022.

He was known for his close relationships with Prince William and Prince Harry, attending both of their weddings—Prince William’s to Catherine Middleton in 2011 and Prince Harry’s to Meghan Markle in 2018. Lord Fellowes was also depicted by actor Andrew Havill in the Netflix series “The Crown.”