The diagnosis could cause some shake- ups in the royal family.

Having William around would certainly help with that sense of normalcy.

He’s also set to attend the annual fundraising gala for the London Air Ambulance that evening.

King Charles III at his coronation

Being open about having cancer was not the standard that monarchs before King Charles followed.

Her father, King George VI, had lung cancer, and even had an entire lung removed.

At any rate, many are certainly wishing the king a speedy recovery.

Princess Anne, King Charles, and Queen Camilla at an event

King Charles and Prince William at an event in ceremonial dress