LONDON — King Charles III took part in his first Trooping the Colour on Saturday, marking his first official birthday as monarch.

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King Charles III joined 1,500 soldiers, 300 horses, and hundreds of musicians from Buckingham Palace to the Horse Guards Parade in St. James’ Park, CNN reported.

King Charles III wore a Welsh Guard uniform with a leek emblem on his collar along with a green and white plum on his bearskin, according to CNN.

For the first time in nearly 40 years, a monarch rode horseback at an event, according to the BBC. The late Queen Elizabeth II last rode her horse, Burmese, back in 1986.

King Charles III was followed by Prince William, Princess Anne, and Prince Edward, according to CNN. Behind them was a carriage with Queen Camilla, Kate Middleton, Prince George, Princess Charlotte, and Prince Louis.

“The coronation was very serious … there was a lot of medieval pageantry. This is much more military-focused. This is so much more about connecting King Charles with his own history in the Marines, the RAF - he has a strong connection to the military,” Bidisha Mamata, broadcaster and royal watcher, told CNN.

Thousands of people watched the event at the Horse Guard’s Parade, according to the BBC.

The Royal Family said in a statement that the Troop of the Colour dates to the early 18th century or even earlier. It is when the colours (flags) of the battalion are carried (also known as “trooped”) down the ranks.

“Since 1748, this parade has also marked the Sovereign’s official birthday. Last year, during the Trooping of the Colour of Queen Elizabeth II’s Platinum Jubilee, The King took the salute at Horse Guards on behalf of Her Majesty,” the Royal Family said in a statement.

This year’s ceremony is especially important because this year markS King Charles III’s first Trooping of the Colour of his reign, the Royal Family said in a statement. He has been attending his Trooping of the Colour since 1951 when he was 3 years old.

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