Queen Elizabeth II and Prince Philip have been married for over 70 years. But this doesn’t mean that things have always been great for the royal couple.

Body language expert Blanca Cobb said that she could pinpoint the exact moment when the Queen and the Duke of Edinburgh’s marriage turned quite frosty. In 2007, royal correspondent James Whitaker also said that Her Majesty and Prince Philip still have blazing rows.

Cobb analyzed Prince Philip and the monarch’s 1947 wedding portrait, where the former holds the latter’s hand. The expert said that the royal couple’s connection was still solid back then.

But years later, things changed between the couple. One of their photos showed Prince Charles and Princess Anne positioned in between them.

“When you position a child between your body and your partner’s, you create a physical distance that could be rooted in a psychological desire for space,” Cobb said. The expert added that the Queen looked distracted in one of her throwback photos with her husband.

That same year, the Queen’s father, King George VI, passed away. Cobb said that one of the royal family’s photos was such a key moment. In the snap, Prince Philip is standing behind his family. Cobb said that this was the dad of four’s way of saying that he supports his wife and is happy to give her the limelight.

However, Cobb also said that standing erect behind the other members of the family separated Prince Philip from them, who are all leaning forward. “The expression gives you a sense of what’s going on in the moment, but the mirroring shows they’re emotionally on the same wavelength,” Cobb said.

But the moment when the couple really became disengaged took place while they were in Malta in November 1967. One of the photos showed the Queen using her husband like a hand rest, which is not intimate at all, according to the body language expert.

Despite all of their tensed moments and issues, royal correspondent Camilla Tominey said that the royal couple is very well matched. “She took on somebody her own size,” she said. “He is the one person who can categorically tell her if something is not going well,” she added.

Queen Elizabeth and Prince Philip Britain's Queen Elizabeth II (L) and Britain's Prince Philip, Duke of Edinburgh (R), wait for the carriage carrying Princess Eugenie of York and her husband Jack Brooksbank to pass at the start of the procession after their wedding ceremony. ALASTAIR GRANT/AFP/Getty Images