Queen Elizabeth’s reign as the head of the monarchy has been very successful. But by the looks of it, she wouldn’t have made it if not for Prince Philip.

While speaking with Radio Times, royal author Gyles Brandreth said that the Duke of Edinburgh is the co-author of Her Majesty’s record-breaking reign.

“The Queen wears the crown, but her husband wears the trousers. He is the power behind the throne – shrewd, steadfast, never-failingly supportive,” Brandreth said.

Prince Philip and the Queen have been married for over seven decades. But even though their relationship is regarded as successful, their union wasn’t perfect. There were a handful of times wherein the Queen and Prince Philip got into a fight. And on one occasion, Her Majesty was unable to hold back her tears.

During another heated incident, the Queen urged Prince Philip to shut up after the dad of four kept commenting on something that he wasn’t really knowledgeable about. But despite their issues as a married couple, Her Majesty and Prince Philip still decided to stay together.

Meanwhile, Brandreth also talked about Prince Philip and Prince Charles during his interview. He said that the two royal men couldn’t be more different from one another. Prince Charles was described as a romantic, while Prince Philip is a pragmatist. And as such, the two didn’t always get along well with each other.

But despite the Duke of Edinburgh’s pragmatistic attitude, the Queen still saw him as her strength and stay. During one of her speeches, Her Majesty credited Prince Philip for helping her out with everything.

At present, the couple doesn’t get to see each other as much as they used to. After all, Prince Philip is already retired since he’s already 98 years old. The Queen, on the other hand, is still busy with her royal duties and engagements. She still lives at the Buckingham Palace, while Prince Philip spends most of his days in Sandringham or in Windsor.

Queen Elizabeth II, Prince Philip
Pictured: The Queen, Prince Philip depart a Service of Commemoration for troops who were stationed in Afghanistan on March 13, 2015 in London, England. Getty Images/Chris Jackson