"The Dual Birthday Tradition: King Charles vs. Prince William"

The British monarch celebrates two birthdays every year, one on their actual day of birth and the other during Trooping the Colour, a tradition that began in 1748. King Charles III will attend his first Trooping the Colour parade as sovereign on June 17, marking his official birthday. The tradition of two birthdays may wane if Prince William or his oldest son, Prince George, take the throne in the future, as their birthdays already fall in the summer. Trooping the Colour involves hundreds of soldiers and horses marching from Buckingham Palace to Horse Guards Parade, and the late Queen Elizabeth often participated in the parade despite her birthday being in April.