IN CHARACTER, they are markedly different, but the 70-year marriage between the Queen and the Duke of Edinburgh has stood the test of time.

Their union, which has stretched from the 1940s well into the 21st century, has provided the monarchy with stability and steadfastness through the decades.

While Elizabeth II is seen as passive, cautious and conventional, the Duke is more adventurous, tempestuous and active.

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The success of their partnership, which will see them celebrate their platinum wedding anniversary on Monday, has been put down to their compatibility. They have shared interests and the same dutiful royal training. Both love horses and outdoor life. Both regard displays of emotion as something to be kept private.

Their grandson, the Duke of Cambridge, has summed up their bond.

“He makes her laugh because some of the things he says and does, and the way he looks at life is obviously slightly different than her, so together they’re a great couple,” William has said.

The unwavering partnership between the monarch and her consort has remained intact, even when the younger generation’s marriages have fallen by the wayside.

Philip was at Elizabeth’s side when she acceded to the throne in 1952, and for more than 65 years has been with her as she carries out her role as sovereign, becoming the nation’s longest-reigning monarch along the way.

Now in their nineties, the couple have entered a new phase in their marriage.

While the Queen continues her duties as head of state, Philip, 96, is enjoying retirement, spending time at Wood Farm on the Sandringham estate, reading and painting, away from royal engagements.

Their partnership was a traditional one and the Queen grew up in a world where it was the man who was in charge at home.

Lord Charteris, the Queen’s former private secretary, once recalled: “Prince Philip is the only man in the world who treats the Queen simply as another human being.

“He’s the only man who can. Strange as it may seem, I believe she values that.”

Philip is known for his bluntness, but the Queen has apparently not been averse to telling him to “shut up” when necessary.

The difficulties faced by the royal family during 1992, the Queen’s “annus horribilis”, were said to have brought the couple closer together, with the Duke being more considerate and supportive.

After her coronation, just a few years after they married, Philip watched the Queen become the most important woman in the country and discovered his own children would not be allowed to take his name. He also gave up his promising naval career to be by her side.

At the start of her reign, he helped her in particular with her public speaking, encouraging her to lower her voice when she spoke.

A cruise of Commonwealth countries in 1956 took the Duke away from the Queen for four months, prompting rumours of a rift between them. But there was no evidence that all was not well.

On their golden wedding anniversary in 1997, Philip praised his wife for her abundance of tolerance.

“I think the main lesson we have learned is that tolerance is the essential ingredient of any happy marriage,” he said.

He added: “It may not be quite so important when things are going well, but it is absolutely vital when the going gets difficult. You can take it from me that the Queen has the quality of tolerance in abundance.”

She in turn spoke fondly of him: “He is someone who doesn’t take easily to compliments but he has, quite simply, been my strength and stay all these years, and I, and his whole family, and this and many other countries, owe him a debt greater than he would ever claim, or we shall ever know.”