Kensington Palace would not elaborate further but said the Princess of Wales, who is recovering from abdominal surgery, continues to be doing well.
William was due to deliver a reading at the service at St George's chapel in Windsor castle for Constantine II of Greece, who died in January last year.
The prince called the former Greek king's family, who were attending the service, to let them know he was unable to attend.
Queen Camilla led the royal family at the service, attended by a large number of Constantine's family and foreign royalty, as the King is continuing to receive treatment for cancer.
Diese Geschichte stammt aus der February 28, 2024-Ausgabe von The Guardian.
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