Royals Kate Middleton Attends Order of the Garter 14 Years After Making Debut as Prince William's Girlfriend Kate's appearance at the royal service was a huge sign that she was being accepted into the royal family fold By Erin Hill Erin Hill Twitter Senior News Editor, PEOPLE People Editorial Guidelines Published on June 13, 2022 10:22 AM Share Tweet Pin Email Kate Middleton attended one of the oldest royal traditions on Monday: Order of the Garter. The order of chivalry was founded by King Edward III in 1348, and the Duchess of Cambridge, 40, made her royal debut at the prestigious event back in 2008 when she and Prince William were dating. William also received his Order of the Garter knighthood that year, so it was a momentous occasion. Kate's appearance at the ceremony was a significant signal that she was being welcomed into the royal family fold. Kate and William, who began dating in 2003, met while studying at the University of St. Andrews. She and William tied the knot at Westminster Abbey three years later on April 29, 2011. Kate Middleton at Order of the Garter in 2022 and 2008. Toby Melville - WPA Pool/Getty Images; Shutterstock Kate Middleton and Prince William Crack a Joke About Prince Louis' Cheekiness at the Platinum Jubilee Kate Middleton. Toby Melville - WPA Pool/Getty Images It was clear during her 2008 appearance that Kate, who wore a polka-dot black skirt suit and matching hat for the event, was already very comfortable with William's family as she chatted happily with Prince Harry and Camilla, Duchess of Cornwall. Prince Harry, Kate Middleton and Camilla, Duchess of Cornwall at Order of the Garter in 2008. Tim Graham Picture Library/Getty The Order of the Garter ceremony has been a constant thread in their relationship. Less than two months after her royal wedding, Kate appeared at the event — this time riding in the carriage alongside her new husband. Prince Charles, Kate Middleton and Prince William at Order of the Garter in 2011. Arthur Edwards - WPA Pool /Getty For the 2011 ceremony, Kate wore a silver Katherine Hooker dress and matching coat with grey suede pumps and a matching hat. For more on Kate Middleton, listen below to our daily podcast PEOPLE Every Day. And in 2014, Kate, in a pastel blue Christopher Kane coat dress, beamed at William who was caught giving her a sweet smile as he looked over at her during his parade to Windsor Castle. Kate Middleton and Prince William at Order of Garter ceremony 2014. Arthur Edwards - WPA Pool /Getty Can't get enough of PEOPLE's Royals coverage? Sign up for our free Royals newsletter to get the latest updates on Kate Middleton, Meghan Markle and more! On Monday, Kate arrived in a bright blue coat dress by Alexander McQueen (her wedding dress designer!) and a matching hat by Juliette Botterill.