Prince Philip, Duke of Edinburgh, in 2015.

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LONDON — Prince Philip, the Greece-born royal who as the husband of Queen Elizabeth II was the longest-serving consort to a British sovereign, died Friday. He was 99.

“His Royal Highness passed away peacefully this morning at Windsor Castle,” the royal family announced. “Further announcements will be made in due course. The Royal Family join with people around the world in mourning his loss.”   

The Duke of Edinburgh’s death came 12 days before Queen Elizabeth’s 95th birthday on April 21. Under a long-standing plan known as “Operation Forth Bridge,” his death ushers in a period of national mourning.

 Philip, whom the queen referred to as “my strength and stay,” was hospitalized in February after “feeling unwell,” and was treated for an infection and a preexisting heart condition, Buckingham Palace said. He was released a month later after undergoing a heart procedure.

Prime Minister Boris Johnson said in a statement that “it was with great sadness” he had been informed of Philip’s death, reflecting on the duke’s “extraordinary life and work” and offering his condolences to the queen.

“Like the expert carriage driver that he was he helped to steer the royal family and the monarchy so that it remains an institution indisputably vital to the balance and happiness of our national life,” Johnson said. “We mourn today with Her Majesty The Queen, we offer our condolences to her and to all her family, and we give thanks, as a nation and a Kingdom, for the extraordinary life and work of Prince Philip, Duke of Edinburgh.”

The duke, who popularized the sobriquet “The Firm” for Windsor family business, ended his official duties in the fall of 2017. Months earlier, in June, he was hospitalized for an infection and missed the Queen’s Speech opening the newly elected Parliament that month.

Two days after missing Easter 2018 services at St. George’s Chapel, he was admitted to King Edward VII Hospital for previously scheduled hip replacement surgery, the palace said. That 10-day hospitalization came weeks before the birth of Prince William and Kate’s third child, Prince Louis Arthur, and the marriage of Prince Harry to Meghan Markle on May 19, 2018, at St. George’s.

In January 2019, Philip was uninjured after he was involved in a collision while driving a Land Rover — at age 97 — near the queen’s Sandringham estate. The vehicle overturned, according to witnesses, and two women were treated for injuries. Weeks later, he decided to turn in his driver’s license.

During the coronavirus pandemic, Philip and Elizabeth had been staying at Windsor Castle, west of London.

The Duke of Edinburgh supported his wife throughout an unprecedented time of social, economic, technological, political change and family crises.

Fourteen prime ministers held office while Philip was British consort — companion to the sovereign — from Winston Churchill in 1952 through Johnson.

Queen Elizabeth II and the Duke of Edinburgh wave from the balcony at Buckingham Palace during the queen’s coronation celebrations June 2, 1953.

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Both the duke and the queen, the world’s longest-reigning monarch, witnessed the transformation of a once-global British Empire into a Commonwealth of 52 independent member states, a free association headed by the queen.

Philip’s public statements had been few and far between in recent years and, even rarer were his direct dealings with the media. Previously, the duke was renowned for speaking his mind at public engagements, many times with cringe-worthy remarks that bent the bounds of humor.

During the 1981 recession, for example, he said: “Everybody was saying we must have more leisure. Now they are complaining they are unemployed.”

“Aren’t most of you descended from pirates?” Philip asked a wealthy resident of the Cayman Islands in 1994.

“You’re too fat to be an astronaut,” he told a 13-year-old boy in 2001.

When meeting in 2012 with a mayor who used a mobility scooter, Philip asked him: “Have you run over anybody?”

Early life

Philip was born June 10, 1921, on the Greek island of Corfu as the youngest child and only son of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg. Andrew, whose father, King George I of Greece, was assassinated in 1913, was a commander in the Greek army during the 1919-1922 war with Turkey. With Greece’s defeat, Andrew and the family were exiled in 1922, settling in France.

Philip’s maternal grandfather, Prince Louis of Battenberg, renounced his German titles, adopted the surname Mountbatten, an Anglicized version of the German Battenberg, and became a British citizen.

At age 7 in 1928, Philip was sent to school in England. He lived with his maternal grandmother, Victoria Mountbatten, and his uncle George Mountbatten.

Philip’s four sisters married German aristocrats, and three of them — Sophie, Cecilie and Margarita — joined the Nazi party. To be sure, one of his brothers-in-law was among those implicated in the 1944 plot to kill Adolf Hitler.

In an interview with historian Jonathan Petropoulos published in his 2006 book “Royals and the Reich,” Philip stressed that he was never “conscious of anybody in the family actually expressing anti-Semitic views,” but he acknowledged there were “inhibitions about the Jews” and “jealousy of their success.”

Lt. Philip Mountbatten, prior to his marriage to Princess Elizabeth, saluting as he resumes his attendance at the Royal Naval Officers School at Kingsmoor, Hawthorn, England, July 31, 1947.

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As a teenager, Philip joined the Royal Navy and went on to serve in World War II, including participating in the battles of Cape Matapan and Crete and the invasion of Sicily. He was in Tokyo Bay for the Japanese surrender on Sept. 2, 1945, and would later receive the Greek War Cross of Valor for his services in the Navy.

Royal matrimony

In 1947, the 26-year-old Philip married his third cousin, Princess Elizabeth, 21, and in doing so, renounced his Greek title to become a naturalized British subject. He was later made Duke of Edinburgh by Elizabeth’s father, King George VI.

The royal matrimony at that time was not without controversy since Philip was not a native son. The Queen Mother reportedly referred to him as “the Hun.” Nevertheless, the couple married in Westminster Abbey and received more than 2,500 wedding gifts from around the world. One year later, son and heir to the throne Charles was born, followed by Anne, Andrew and Edward.

Princess Elizabeth and Prince Philip, Duke of Edinburgh, waving to a crowd from the balcony of Buckingham Palace, London shortly after their wedding at Westminster Abbey.

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Philip’s naval career, which had seen the newly married couple stationed in Malta for a short period, subsequently ended when George VI died Feb. 6, 1952, and Princess Elizabeth became queen.

The duke assumed his new role as consort, accompanying Her Majesty around the world on domestic trips, state visits and Commonwealth tours.

Elizabeth was formally crowned queen in 1953 in the first live television coronation to be broadcast globally. Shortly thereafter, Philip and Elizabeth embarked upon a seven-month international tour, visiting 13 countries and logging over 40,000 miles.

‘Nobody’s ever forgotten meeting him’

Alongside his royal commitments, the duke became a qualified pilot and regularly played polo until his 50th birthday. Philip achieved many flying qualifications that would see him receive his Royal Air Force wings in 1953, helicopter wings two years later and private pilot’s license in 1959.

Prince Philip, in flying overalls, being presented with his army wings by Brigadier Colin Kennedy, commandant of the Army Air Corps Centre, during the duke’s visit.

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In an official capacity, Philip traveled to more than 140 countries.

“The great thing about my father is that nobody’s ever forgotten meeting him, so they’ve all got their stories,” Prince Edward, the Earl of Wessex, said during an engagement at Windsor Castle in May 2017.

“Wherever he’s been, wherever in the world — people remember him. You can’t really get a better accolade than that,” he added.

Queen Elizabeth II and Prince Philip’s reign also had to endure times of crises, including the British monarch being shot at with blanks in 1981. Two years earlier, the queen’s art advisor, Anthony Blunt, was revealed to be a Communist spy, and Philip’s uncle, Louis “Dickie” Lord Mountbatten, was killed by an Irish Republican Army bomb.

In 1992, the marriages of three of their children collapsed. Andrew and Anne divorced from their spouses and Charles and Diana began a separation that ended in divorce four years later. Also in 1992, fire gutted Windsor Castle, one of the couple’s official residences. The queen described this 12-month period as an “annus horribilis.”

Queen Elizabeth, Prince Philip, Prince Charles and Princess Diana at Buckingham Palace for Trooping the Colour. In front are Prince Harry and Prince William.

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During Charles and Diana’s troubles, Philip reportedly counseled the couple to reconcile, but to no avail. A year after the 1996 divorce, Diana and her boyfriend Dodi Fayed were killed in a Paris car crash as photographers were chasing their limousine. Before the funeral, Philip successfully encouraged his 15-year-old grandson, William, to walk behind Diana’s casket. Sixty years earlier, the then-16-year-old Philip marched behind the casket of his sister Cecilie after she was killed in a plane crash.

“If you don’t walk, I think you’ll regret it later,” Philip told William, according to British media accounts. “If I walk, will you walk with me?”

Fayed’s father claimed that Philip had ordered the couple executed, but in 2008, a London coroner rejected Mohamed al Fayed’s conspiracy allegations, ruling there was no such evidence. The jury eventually decided that the crash resulted from grossly negligent driving by the couple’s chauffeur and the pursuit of their limousine by paparazzi.

‘I … owe him a debt greater than he would ever claim’

Queen Elizabeth II sits with Prince Philip as she delivers her speech during opening ceremony of Parliament in the House of Lords at Westminster on June 4, 2014, in London.

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In the decades following his marriage to the queen, the Duke of Edinburgh had taken up more than 22,000 solo engagements, 637 overseas visits, delivered an estimated 5,493 speeches and worked as a patron to almost 800 organizations, according to the royal website.

One of his most successful associations has arguably been the creation of the Duke of Edinburgh Award, a youth self-improvement program that has been running for 65 years.

In May 2017, the palace announced that the then-95-year-old prince would permanently discontinue his royal duties as of the fall. Philip and his wife had gradually passed on some of their respective workload in recent years. Their son and heir, Prince Charles, as well as grandsons, Princes William and Harry and other family members assumed more collective responsibility until Andrew was effectively stripped of his royal duties in 2019 because of his association with the late sex offender Jeffrey Epstein and Harry stepped back as a senior royal in 2020.

The queen said in tribute to her husband on their golden wedding anniversary on Nov. 20, 1997, “Quite simply, (he has) been my strength and stay all these years, and I and his whole family, in this and many other countries, owe him a debt greater than he would ever claim or we shall ever know.”

The couple celebrated their 70th wedding anniversary in November 2017. During their private celebration at Windsor Castle, Elizabeth presented him with the Grand Cross of the Royal Victorian Order for “services to the sovereign.”

Survivors include his wife, Queen Elizabeth II, and their children: Charles, Prince of Wales; Anne, Princess Royal; Prince Andrew, Duke of York; and Prince Edward, Earl of Wessex. The queen and Philip also had eight grandchildren and 10 great-grandchildren, including Augustus Philip Hawke Brooksbank, who was born Feb. 9, 2021, to Princess Eugenie and her husband, Jack Brooksbank, and is is named in part to honor the Duke of Edinburgh.

Philip had insisted that he did not want the “fuss” of a state funeral at Westminster Hall, according to The Times of London. Instead, his body is expected to lie in St. James’s Palace, where Prince Diana’s body lay before her funeral.

Britain’s Prince Philip, in his role as captain general of the Royal Marines, attends a parade to mark the finale of the 1664-mile Global Challenge run, on the Buckingham Palace forecourt, in central London Aug. 2, 2017. The 100-day trek recognizes the year the Royal Marines were founded.

Yui Mok | Reuters

— CNBC’s Marty Steinberg is based in New Jersey.