There have been 13 American presidents in power during the Queen’s reign so far.

Following Donald Trump’s visit to Windsor Castle on Friday, the monarch will have met all of them – except one.

Lyndon B Johnson, who took over in 1963 following John F Kennedy’s assassination, never crossed paths with the Queen.

Elizabeth II has played a pivotal role over the decades in the UK’s relationship with the leaders of one of its closest allies.

Harry S Truman

In 1951, a young Princess Elizabeth – unknowingly three months away from becoming queen – travelled to Washington and saw President Harry S Truman, who was still in the Oval Office when she acceded to the throne.

Princess Elizabeth and Harry TrumanPresident Harry S Truman welcoming his guest Princess Elizabeth to Washington DC (PA)

Dwight D Eisenhower

During her first state visit to America in 1957, now a Queen, she met Dwight D Eisenhower.

They met again in Canada in 1959 and travelled on the Royal Yacht Britannia together.

The Queen and EisenhowerThe Queen and American president Dwight D Eisenhower in Quebec (PA)

The Queen was said to have had an affectionate relationship with Mr Eisenhower, who was even invited to stay at the Queen’s Scottish hideaway Balmoral Castle.

John F Kennedy

The glamorous JFK and his wife Jackie dined with the Queen and the Duke of Edinburgh at Buckingham Palace in June 1961.

JFK and the QueenPresident John Kennedy with his wife Jacqueline, meeting the Queen and the Duke of Edinburgh (PA)

Lyndon B Johnson

Mr Johnson, then vice-president, took over after Mr Kennedy’s assassination in 1963.

He was president until 1969 – but the Queen never met him, and he died in 1973.

Richard Nixon

Richard Nixon dined with the Queen at Buckingham Palace in February 1969.

The Queen also met Mr Nixon at Chequers in October 1970 and was photographed with him outside the prime minister’s official country residence.

The Queen and Richard NixonThe Queen with prime minister Edward Heath and American president Richard Nixon and his wife Pat at Chequers (PA)

Gerald Ford

In 1976, during the US bicentennial, the Queen met Gerald Ford in the US.

The Queen with Gerald FordThe Queen replies to US president Gerald Ford’s welcoming speech in Washington DC (PA)

Jimmy Carter

In 1977, the monarch was pictured in a billowing, wide-sleeved yellow gown alongside Jimmy Carter, in a black tie and tuxedo, when he came to London.

Politics – President Jimmy Carter Visit to Britain – Buckingham PalaceThe Queen with US president Jimmy Carter at a dinner at Buckingham Palace (PA)

Ronald Reagan

Ronald and Nancy Reagan stayed at the Queen’s favourite home Windsor Castle in 1982.

The monarch and the former film star shared a bond through their love of horses and rode side by side in Windsor Great Park.

Queen and ReaganUS president Ronald Reagan goes riding in Windsor Home Park with the Queen (PA)

Both looked relaxed and informal in jodhpurs and riding boots, with the Queen dressed down in her headscarf.

She also met Mr Reagan during an official visit to America’s West Coast in 1983.

George Bush Snr

George Bush Snr had lunch with the Queen at Buckingham Palace in 1989.

Queen and George BushAmerican president George Bush stands next to the Queen in the Picture Room at Buckingham Palace (PA)

She also visited him in the US in 1991 – the trip that led to “Podiumgate” – when all that could be seen of the Queen above the lectern when she was delivering an address on the White House lawn was her hat.

Bill Clinton

Bill Clinton and his wife Hillary met the Queen several times, including in December 2000 when, along with daughter Chelsea, they dropped in on the Palace.

The Queen and Bill Clinton US president Bill Clinton, his wife Hillary and the Queen at Buckingham Palace (PA)

George W Bush

George W Bush visited the head of state at the Palace in July 2001.

Two years later in November 2003, Mr Bush paid an official state visit – the first by a US leader – and the Queen gave him a wide smile as they shook hands at her London residence.

When the Queen encountered Mr Bush again in Washington DC in 2007, the president winked at her after making a gaffe.

The Queen and George W BushGeorge W Bush winks at the Queen (Fiona Hanson/PA)

At a welcome ceremony on the south lawn of the White House, he mixed up his dates in a speech – almost ageing the Queen by 200 years.

Turning to the Queen and winking, he joked to his audience: “She gave me a look that only a mother could give a child.”

Mr Bush – in 2008 – was also received by the Queen at Windsor Castle.

Barack Obama

The Queen’s relationship with Barack Obama was a warm and friendly one.

The Obamas and the QueenUS president Barack Obama and his wife Michelle with the Queen and the Duke of Edinburgh at Buckingham Palace in 2009 (John Stillwell/PA)

They hit it off after a reception ahead of the G20 summit in 2009.

The Queen and first lady Michelle Obama acted like old friends when they put their arms around each other at the end of the event.

A successful state visit to the UK followed in 2011 and the Obamas forged a strong bond with the Queen and her wider family – particularly Prince Harry, now the Duke of Sussex, and the Duke and Duchess of Cambridge.

Prince George and the ObamasPrince George meeting Barack and Michelle Obama at Kensington Palace (Kensington Palace/Pete Souza/White House/PA)

The Obamas even dropped in to see the Queen the day after her 90th birthday.

The Duke of Edinburgh, then 94, drove the couple the short distance to Windsor Castle after their Marine One presidential helicopter touched down on the manicured lawns of the royal residence.

The Obamas also met Prince George, who was ready for bed in his dressing gown, ahead of dinner with William, Kate and Harry at Kensington Palace.

Donald Trump

Mr Trump will be accorded a guard of honour at Windsor Castle and also have tea with the Queen on Friday.

Donald Trump US President Donald Trump will meet the Queen on Friday (Matt Cardy/PA)

But this will not be a state visit – an offer extended to Mr Trump by Prime Minister Theresa May in the early days of his presidency.

There will be no carriage procession and no opulent state dinner, and, as such, no other members of the royal family will call in to meet the controversial billionaire-turned-politician.