The royal couple, who were front and center of this year's National Service of Remembrance memorial alongside King Charles and Queen Camilla, took some to write a short tribute to honor the fallen war soldiers from the U.K. and Commonwealth nations.
"In memory of all those who have made the ultimate sacrifice. We will remember them," they wrote.
Prince William, 40, solemnly placed the poppy wreath, which was adorned with Prince of Wales feathers and a Welsh red ribbon, on the Cenotaph war memorial on behalf of him and his wife, 40, who looked on from the balcony of the Foreign and Commonwealth Office.
Yui Mok/PA Images via Getty
The royal family each wore a pin with a red poppy to the ceremony — a symbol that has been used since 1921 to signify Remembrance Day.
King Charles and Prince William each wore a single poppy pinned to their lapel, while Queen Camilla and Kate Middleton both wore three poppies. The three poppies that Middleton wore are believed to represent her fallen family members from World War 1 on her great-grandmother Olive Middleton's side.
The official Twitter account for the Prince and Princess of Wales tweeted out some photos of the event, including shots of the procession of war veterans and candid pictures of William and Kate throughout the ceremony.
Prince William and Kate changed their profiles on Twitter and Instagram earlier this week to reflect Remembrance Day, updating their cover photo to depict the Field of Remembrance with crosses and red poppies. They also changed their profile picture to show a shot of them at the Festival of Remembrance at Royal Albert Hall.
The Royal Family Twitter profile was also similarly updated with the Field of Remembrance imagery, and the updated profile picture showed King Charles and Queen Camilla looking off into the distance, both wearing black with a red poppy pin.