It's not just in the UK that the Queen was adored, as Her Majesty was much-loved by the American people and many considered her a key factor in the two nations' 'special relationship'. During her incredible 70-year reign, the Queen met with 13 out of the 14 Presidents - with many viewing their audience with the Monarch as one of the biggest highlights of their time in the White House.
From meeting Harry Truman in 1951 to seeing current US President Joe Biden last year, the Queen made a particular effort to cement the bond with her cousins across the Pond. She was even gracious enough to overlook a number of faux pas - with many Presidents and their First Ladies struggling to follow royal protocol when meeting Her Majesty.
Joe Biden (twice)
President Joe Biden, who met the Queen for the first time in the 80s, was reunited with her as the US leader during a state visit in June last year.
Mr Biden's motorcade swept into a G7 dinner reception after the Queen, which is considered to be a breach of royal protocol.
The POTUS's 18-car convoy arrived at the Eden Project five minutes after the monarch got there with Prince William and Kate, and Prince Charles and Camilla.
All guests are traditionally meant to be in place before HM arrives for any official occasion.
He also kept his sunglasses on while he stood alongside the Queen and his wife Jill as the American national anthem was played.
It seems like Biden, who attended Her Majesty's funeral last week, also broke an unspoken rule by revealing his personal conversations with the Queen.
He said they talked about a range of topics and the Queen asked him about his relationship with Xi Jinping and Vladimir Putin - the leaders of China and Russia.
The president told reporters: "She wanted to know what the two leaders that I - the one I'm about to meet with, Mr Putin, and she wanted to know about Xi Jinping."
It is very rare for anyone to disclose what is said during conversations with the Queen, although she may have given him approval.
Some have theorised that Biden's comments may have been "cleared and arranged in advance to give royal weight to the G7's democratic values and "indicate the Queen had concerns" about threats to democracy.
Michelle Obama
Michelle Obama controversially broke royal protocol during a visit to Buckingham Palace in 2009 with her husband, President Barack Obama.
The First Lady caused a stir when she breached the 'no touching' rule to give Her Majesty a sweet hug - a gesture which royal commentators branded "extraordinary".
Michelle later explained that their feet were aching in their high heels, so she put her arm around the Queen in a touching moment.
Writing in her memoir, Michelle said: "Forget that she sometimes wore a diamond crown and that I'd flown to London on a presidential jet; we were two tired ladies oppressed by our shoes.
"I then did what's instinctive to me anytime I feel connected to a new person, which is to express my feelings outwardly. I laid a hand affectionately across her shoulder."
Michelle recalled that Her Majesty had commented on how tall she was and asked her if her shoes pinched, so they bonded over their shared pain.
She added: "I couldn't have known it in the moment, but I was committing what would be deemed an epic faux pas.
"If I hadn't done the proper thing at Buckingham Palace, I had at least done the human thing.
"I daresay the Queen was okay with it, too, because when I touched her, she only pulled closer, resting a gloved hand lightly on the small of my back."
Michelle also said thet the Queen had branded royal protocol as "rubbish" and told her to sit anywhere when she got in a helicopter at Windsor.
Donald Trump (many, many times)
It will come as no surprise that Donald Trump makes this list.
The former US President has often shared his love for Her Majesty - with his Scottish-born mother being a big fan of the Monarch.
However, it didn't stop the outspoken leader breaching royal protocal several times during his state visit to the UK back in 2018.
During the visit to Windsor Castle, Trump decided to shake the Queen's hand rather than go for the traditonal bow, although it's not a hard and fast rule and he did appear to lower his head.
While that wasn't of too much concern, he did break the rules when he walked in front of Her Majesty while they were inspecting her honor guard.
He even blocked her off when he abruptly stopped in her way, which caused anger from some corners.
Labour MP David Lammy tweeted: "What a disrespectful, discourteous, selfish and appalling way to treat a 92-year-old woman. Let alone the Queen of England, who has served this country faithfully for 66 years."
Trump had also appeared to keep the Monarch waiting for almost 15 minutes in the heat, with one of her aides spotted checking his watch, but he did actually arrived at the scheduled time.
The Apprentice star was invited back for a state dinner at Buckingham Palace the following year - and broke royal protocol once again.
While delivering his speech to the 170 guests in the ballroom, he gestured towards Her Majesty and touched her back as she stood up for his toast.
Royal protocol dictates that a person can only touch the Queen if she offers out her hand first.
But she seemed unfazed by the action as she toasted Trump's words - and clearly saw the funny side as she had a big grin on her face.
Jimmy Carter
During a visit to Buckingham Palace in 1977, Jimmy Carter broke royal protocol by kissing the Queen Mother on the lips.
Thankfully he didn't attempt the same thing with Her Majesty, but her mother was taken aback by the experience.
She reportedly snapped back: "Nobody has done that since my husband died."
Her husband was obviously King George VI, who died in 1952, at which point her eldest daughter became Monarch.
The Queen Mother took a dislike to Carter, although it seems her managed to charm the rest of the Royal Family.
Writing about their encounter, she wrote: "I took a sharp step backwards – not quite far enough."
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