And as they prepare to celebrate their wedding anniversary on 29 April, the Prince and Princess of Wales can reflect on the fact that their "unshakeable" bond has only grown stronger.
As they face what is perhaps the couple's biggest challenge yetKate's treatment for cancer - they have become closer than ever, and they will emerge stronger as a result of their experience, according to royal author Robert Jobson.
"It has been tough on both of them, not least as parents, as they try to reconcile their children's mental wellbeing and the seriousness of her diagnosis," he says.
"But there is no question that William has been Catherine's rock. He is the constant in her life and she is at the heart of his."
Robert, whose book Catherine, the Princess of Wales: A Biography of the Future Queen is published on 4 July, tells HELLO!:
"Their forthcoming anniversary is a testament to not only their love, but also their unity. I'm sure they'll acknowledge their journey, knowing that their strength lies in being together.
"The ups and downs they have weathered together have cemented their bond, which is now unshakeable." The royal couple met while students at the University of St Andrews and became close friends before romance blossomed in 2002.
It has now been 20 years since news of their relationship went public, after they were photographed together on the slopes at Swiss ski resort Klosters.
CERTAIN OF THEIR LOVE
Their courtship was not without its challenges, and they split up for three months in 2007 before getting back together and becoming more committed than ever.
But William, who experienced the breakdown of his parents' marriage, waited until 2010 to propose, explaining later that he had wanted to give Kate "a chance to see in and to back out, if she needed to, before it all got too much".
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STEPPING OUT WITH DAUGHTER VIVIENNE ANGELINA JOLIE SHARES PRIDE IN THEATRE-MAD TEEN AS KIDS REPORTEDLY DROP BRAD'S NAME S
As far as mother-and-daughter duos go, they donât come much cooler than Angelina and Vivienne Jolie.
FROM TOP GUN TO HIT MAN GLEN POWELL ON LEAVING TINSELTOWN TO GO IT ALONE IN TEXAS
Denzel Washington's agent as a cross between Richard Gere and William Hurt and, although it took a while to live up to the compliment, the 35-year-old actor has come to show he embodies those film-star qualities.
DEBUTING A FRESH LOOK AS SHE EMBRACES A NEW CHAPTER CAMILA CABELLO OPENS UP ABOUT SPLIT FROM SHAWN MENDES AND WHY HER NEW ALBUM IS HER MOST PERSONAL YET
From girlband member to solo star, Camila Cabello knows a thing or two about what it takes to be successful in the music industry.
TWENTY YEARS AFTER FINDING FAME ON DESPERATE HOUSEWIVES' EVA LONGORIA BASTON ON TEAMING UP WITH A NEW GROUP OF WOMEN AND WHY YOUNG SON SANTIAGO IS A LITTLE PRO ON SET
She shot to fame playing feisty Gabrielle Solis in Desperate Housewives two decades ago - and Eva Longoria Bastón says fans of the hit show are in for a treat with her latest project.
RUNNING ON PURE JOY, FITNESS INFLUENCER ALICE LIVEING
Alice Living is used to her Alice Liveing is used to exercising her whole body. But when she married long-term partner Patrick Murphy, it was her cheeks that got the workout.
A PERFECT PERFORMANCE THE KING AND QUEEN MEET THE ACTING STARS OF THE FUTURE ON A VISIT TO RADA
They have had their own fair share of family drama, so little wonder the King and Queen chuckled during a performance about the subject at the Royal Academy of Dramatic Art (Rada).
CONFIRMING HER MARRIAGE TO MODEL JAKE BONGIOVI MILLIE BOBBY BROWN IS OVER THE MOON AFTER PAIR WED IN SECRET CEREMONY WITH SEAL OF APPROVAL FROM JAKE'S ROCK STAR DAD
With her arms outstretched and a huge smile on her face, Millie Bobby Brown was the picture of marital bliss alongside her new husband Jake Bongiovi as they drove through the Hamptons in New York state's Long Island after tying the knot.
FOUNDER OF ART'S TOP TALENT AGENCY MARINE TANGUY OPENS THE DOORS OF HER PICTURE-PERFECT TOWNHOUSE IN LONDON'S MARYLEBONE
I fell in love with this house as soon as I saw it,\" French-born art entrepreneur Marine Tanguy says of her Georgian home in London's fashionable Marylebone.
SET TO BOOST THE BRITISH ECONOMY BY ALMOST £1BN TAYLOR SWIFT HOW BRITAIN HAS TURNED INTO A NATION OF SWIFTIES AS THE ERAS TOUR FINALLY ARRIVES IN THE U.K.
HOW BRITAIN HAS TURNED INTO A NATION OF SWIFTIES AS THE ERAS TOUR FINALLY ARRIVES IN THE U.K.
FROM CANDID SNAPS TO ICONIC FORMAL POSES ROYAL PHOTOS ON SHOW BUCKINGHAM PALACE HOSTS A TREASURE TROVE OF REGAL PORTRAITURE FROM OVER 100 YEARS
They join 150 items on display until 6 October, chronicling the history of royal portraiture from the 1920s with work by celebrated photographers from Sir Cecil Beaton to Rankin.
