KING Charles waved to the public as he arrived in London after leaving a memorial service.
Charles, 75, was at Windsor Castle this morning but left before the ceremony for the late King Constantine of Greece began.
The King missed the service as he continues treatment for an undisclosed form of cancer.
The Duke of York led family members including his ex-wife Sarah, Duchess of York, Princess Beatrice, the Princess Royal and Zara and Mike Tindall.
They arrived at the chapel after being driven to the castle quadrangle by coach.
The final member of the British royal family to arrive was the Queen, who was driven down from the castle to the 15th century chapel.
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She was warmly greeted by the Dean of Windsor, the Right Rev Christopher Cocksworth, at the Galilee Porch.
It comes after the Prince of Wales pulled out of attending due to a personal matter.
Kensington Palace would not elaborate further but said the Princess of Wales, who is recovering from abdominal surgery, continues to be doing well.
William, who was due to deliver a reading, called the Greek royal family who are attending the service in St George's Chapel to let them know he was unable to attend.
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Constantine II of Greece, who died in January last year, was William's godfather.
Kate is away from official royal engagements until after Easter following major surgery in January.
Constantine's eldest son Crown Prince Pavlos is to step in to give the reading in William's place.
The King was close to his second cousin Constantine, who was a first cousin once removed and sailing partner of the late Duke of Edinburgh.
Constantine died at the age of 82 in January last year, decades after being toppled from the throne in a military coup.
TIMELINE OF HEALTH WOE
HERE is a date-by-date rundown of the health worries to have struck the royals this year.
JANUARY 16: Kate is admitted to the London Clinic for abdominal surgery.
JAN 17: It is announced that the King is to have treatment for a benign enlarged prostate.
JAN 18: William spends time at Kate's bedside.
JAN 19: The King flies back from Scotland with the Queen.
JAN 21: It is announced Sarah, Duchess of York, has malignant melanoma, a skin cancer.
JAN 23: Kate’s hospital stay passes one week.
JAN 26: The King is admitted to the London Clinic for treatment.
JAN 29: The King is discharged from hospital. Kate leaves the same day.
JAN 31: Queen Camilla announces that the King is "getting on, doing his best".
FEBRUARY 5: Buckingham Palace announces the King has cancer, but not of the prostate, and will not carry out public-facing duties.