Duke and Duchess of Cambridge had a day in the race, participating in the Royal Ascot's famous carriage parade.
William and Kate were queen guests in the royal family on the first day of the famous Berkshire race and are expected to attract about 300,000 racers in the next five days.
"The racing started in Ascot three hundred years ago and has changed a lot, but the words remain untouched and impress us with our beauty, radiance and courage.
"The quality and depth of the competition at the royal conference continued to flourish with the first eight games this week.
Cambridge will present its trophy at the King's Stand Stakes.
The event is attended regularly by the queen, an ardent riding owner and passionate obedience minister, with over 20 Royal Ascott winners.
The procession procession with the queen 's head announces the beginning of the event every day, and the race always wants to see the monarch' s guests riding in the coach.
Royal Ascot is as sociable as sporting events and racing people have the opportunity to activate their style, from stylish hats and summer dresses to keen suits.
Punters traditionally bet on the queen's hat color and liked pink on the first day, liking books like William Hill.
Watch: The Queen, Kate, Harry and Megan arrive in a carriage to smash the color.