Follow CBSPHILLY Facebook Twitter

PHILADELPHIA (CBS) — The newly married Duke and Dutchess of Sussex are heading back to London Sunday.

READ MORE: Crowds Gather In Haddonfield Township For First Major Rollout Of Fourth Of July Fireworks Since Pandemic

A part of their wedding has already arrived at Westminster Abbey.

Meghan Markle Wears Givenchy Wedding Dress To Marry Prince Harry 

Meghan Markle’s wedding bouquet is now resting on the grave of the unknown warrior.

READ MORE: Wheeler, Hoskins, Realmuto Lift Phillies Over Cardinals 4-0

LONDON, ENGLAND – MAY 20: The Duchess of Sussex’s wedding bouquet is laid on the grave of the Unknown Warrior in the west nave of Westminster Abbey on May 20, 2018 in London, England, London. The resting place holds the remains of a First World War soldier who has come to symbolise the nation’s war dead. (Photo by Victoria Jones – WPA Pool/Getty Images)

It’s a tradition that was started by the Queen’s mother after she married King George the Sixth in 1923.

Photos: The Best Photos Of The Royal Wedding 

MORE NEWS: Woman Had Several Valuable Items Stolen While Helping Stranger In West Deptford, Police Say

She asked that her bouquet be left at the grave to honor her brother, who was killed during the first World War.