Prince William and President Donald Trump sparked a social media debate by wearing blue suits instead of black clothing to Pope Francis' funeral on April 26.

Prince William has stepped in to attend the funeral of Pope Francis on behalf of his father, King Charles, with 12 other royals from around the world.

Prince William traveled to Vatican City on Saturday, April 26 in order to attend Pope Francis's funeral. King Charles didn't attend the funeral, which brought together a plethora of world leaders. According to a royal expert, there's an important reason Charles decided to send William to the funeral in his place.