After his tour at sea, Prince Philip reunited with Queen Elizabeth in Portugal, 1957.Photo: Daily Mirror/getty

queen elizabeth and prince philip

“I’d love to know their secret . . . because they are the most lovely couple,” Prince William said ofQueen Elizabethand Prince Philip in 2016, when his grandparents had been married 68 years. (The royal couple, who wed in 1947, would go on to toast six more anniversaries beforePhilip’s death at age 99earlier this month.)

As William marks 10 years of marriage toKate Middleton(which PEOPLE is commemorating in a new special editionWilliam & Kate: 10 Joyous Years), he might consider what the Queen andPrince Philip’s lifelong union looked like, back when they were approaching the same milestone. It wasn’t the easiest year for the young couple, but they had faced its challenges together.

By 1957 the Queen and her husband, the Duke of Edinburgh, were the parents of two young children, Charles and Anne, and Elizabeth had ascended to the throne following her father’s unexpected death at age 56. She and Philip were still working out a balance between private and public life when rumors prompted Buckingham Palace to take the unusual step of issuing a statement, reading: “It is quite untrue that there is a rift between the Queen and the Duke.”

Queen Elizabeth and Prince Philip on their honeymoon in 1947.Central Press/Getty

QUEEN ELIZABETH

Those stories resurfaced in 2017 when season 2 of the Netflix seriesThe Crowndramatized the episode. “People have said, ‘He must have been unfaithful,’ but there is no solid evidence for that,” Robert Lacey, the historical consultant onThe Crown, told PEOPLE at the time. What the show did get right was Elizabeth’s determination to have her marriage succeed. “The Queen was the model of discretion and made absolutely clear thatPrince Philipis the only man she has ever loved,” Lacey says today. Her relationship with Philip was then, as it was until their final days together, “based on a foundation of absolute love.”

Prince Philip and Queen Elizabeth.Countess of Wessex

Prince Philip, Queen Elizabeth

Philip and Elizabeth reunited in Portugal when his tour ended in February 1957. Soon after, she officially dubbed him a prince of the United Kingdom. (Unable to let the rumors go, some papers speculated that the elevated title would shield Philip from having to testify at the Parkers' divorce trial.)

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Ahead of the couple’s tour of North America in the fall of 1957, Philip appeared solo on the cover ofTimemagazine. The accompanying story offered a glimpse into the lives of what the magazine called Britain’s busiest married careerists: “At the start of each busy day, the door between their adjoining bedrooms at the palace is invariably open to permit them to chat while dressing. Even on the most crowded days they try to keep the time between 5 and 6:30 each evening free for a family romp with 7-year-old Anne (andPrince Charleswhen he is not at school); the rare evenings they can spend alone together are frequently devoted to television and an exchange of mocking criticism when one or the other of them appears on the screen.”

queen elizabeth and prince philip

For more, pick up PEOPLE’s tribute issue,Prince Philip: The Lifelong Love Story of Queen Elizabeth and the Duke of Edinburgh, available now wherever magazines are sold.

In Canada, Elizabeth appeared newly confident as she became the first reigning monarch to open Parliament there. Then it was on to the U.S., where President Dwight D. Eisenhower hosted the royal couple at the White House. Back at home, their Nov. 20 anniversary was a private affair, butTimereported there was a dinner party, and gifts from Philip included a piece of jewelry he had designed, white carnations, and a tin kettle, a joking nod to the traditional material honoring a decade of matrimony. They were just 31 and 36 at the time, with so much ahead, including the births of sons Andrew and Edward, weddings, grandchildren and great-grandkids. They were, says Lacey, “partners in life.”

source: people.com