William, the Prince of Wales, will attend the funeral of Pope Francis on Saturday on behalf of his father, King Charles III, Kensington Palace confirmed on Tuesday, per the BBC. Pope Francis died at 88 on Monday. His cause of death was a stroke, which resulted in a coma and the “collapse of his cardiovascular system,” per The New York Times.

Another royal will attend Pope Francis’s funeral in place of King Charles—and while some may be surprised, there’s a royal reason behind the switch. Here’s what we know about the decision.

King Charles III and Queen Camilla are mourning the death of Pope Francis. Charles said he and the queen were "deeply saddened" by the pope's death, but their "heavy hearts were somewhat eased" knowing "His Holiness was able to share an Easter greeting with the Church and the world he served with such devotion throughout his life and ministry,