Crown Princess Olympia of Greece cuts a somber figure as she is joined by her parents and siblings at the memorial service of her grandfather King Constantine in Windsor

The Greek royal family presented a united front today as they arrived at the memorial service for King Constantine in Windsor.

Crown Princess Olympia, 27, looked glamorous in a fitted square-neck navy dress and a black oversized coat as she arrived at St. George’s Chapel with her brothers.

Her father, Crown Prince Pavlos, 56, opted for a navy double-breasted suit and matching tie for the occasion.

Crown Princess Marie-Chantal, 55, looked suitably chic in a burgundy dress and matching shawl.

The mother of four completed her ensemble with a pair of matching suede heels and a black leather clutch.

Meanwhile, Pavlos’ brother Philoppos and his wife Nina arrived arm in arm and dressed in navy blue.

Princess Nina opted for a navy blue co-ord set with a peplum skirt and matching headband.

Today’s service will be attended by several of Europe’s ruling houses, including the former King of Spain.

The Prince of Wales, 41, was expected to give a reading at his late godfather’s service but pulled out at the last minute due to personal reasons.

William called the Greek royal family to apologize, while Kensington Palace confirmed the Princess of Wales is “doing well” as she continues her recovery from abdominal surgery at home.

Today’s service in St. George’s Chapel is held in honor of King Charles’ close friend and great-nephew, Constantine II, the former ruler of Greece.

Greece’s last king died on January 10 last year at the age of 82 after months of illness – more than 50 years after he was exiled in a military coup.

The late king – the only son of King Paul and Queen Frederica – was also the Duke of Edinburgh’s cousin and Prince William’s godfather.

Prince Andrew was spotted with his ex-wife Sarah Ferguson at the Thanksgiving service.

It is understood the Duke of York is attending as a member of the British Royal Family and was invited by the Greek Royal Family.

King Constantine’s funeral was attended by Princess Anne and her husband, Vice Admiral Sir Timothy Laurence, in January 2023.

Constantine became king of Greece in 1964, but was ousted from the throne when the monarchy was abolished in 1973.

King Charles is not expected to attend his memorial service in Windsor after retiring from public life following his cancer diagnosis.

Camilla’s role in the agency will see her take charge again as she tries to take the pressure off her husband.

Members of the royal family have rallied behind the king, with Prince William returning to his duties after spending time caring for his wife, Princess Kate.

Due to a separate health crisis, the Princess of Wales was admitted to the London Clinic for a planned abdominal operation, and will be unable to fulfill royal duties until at least Easter.

Last month, Greece’s royal family put on a somber display as they attended a memorial service to mark one year since the death of King Constantine.

He died “of a stroke”, local media reported, after several hospital admissions in the previous months.

High-profile royals including Constantine’s son Crown Prince Pavlos and Dowager Queen Anne Marie attended a private ceremony at the former summer palace of Tatoi, just outside Athens.

Last year, Crown Princess Olympia split from her boyfriend of three years Peregrine Pearson – shortly before the aristocrat was pictured kissing Game of Thrones actress Sophie Turner.