Trooping the Colour is the annual celebration of the U.K. monarch’s birthday.
The royal family will also be a part of the parade.
This will be the first time a monarch has led the parade on horseback in a long time.
For over 30 years, Queen Elizabeth II led the parade in a horse-drawn carriage.
Prince Philip eventually joined her in the carriage in 2003; previously he’d been on horseback as well.
Other royals riding during the parade will be Prince William and, most likely, Princess Anne.
