Queen Elizabeth with Ronald Reagan

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Queen Elizabeth with Ronald Reagan: Queen Elizabeth delivers a speech while President Ronald Regan smiles as he listens. Ronald and Nancy Reagan stayed at Windsor Castle in 1982. (Agencies)

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Queen Elizabeth with Jimmy Carter: In 1977 the Democrat president Jimmy Carter came to London and met Queen Elizabeth. Jimmy Carter joins the Queen and Prince Philip at Buckingham Palace on 7 May 1977. (Agencies)

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Queen Elizabeth with Richard Nixon: President Nixon had lunch with the Queen at Buckingham Palace in February 1969. He returned the following year to visit Edward Heath. President Nixon meets the Queen. (Agencies)

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Queen Elizabeth with John F. Kennedy: There was huge media interest when President Kennedy and his wife Jackie dined at Buckingham Palace in June 1961 with the Queen and Duke of Edinburgh. John F Kennedy and his wife Jacqueline pose with the Queen and Prince Philip at Buckingham Palace on 5 June 1961. (Agencies)

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Queen Elizabeth with Dwight D. Eisenhower: On the Queen Elizabeth's first American state visit in 1957, President Eisenhower was her host. He was the first serving president she met during her reign. The Queen with Dwight D Eisenhower at a White House State banquet on October 20, 1957. (Agencies)

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Queen Elizabeth with Harry S. Truman: Princess Elizabeth and Harry S Truman sit in the library of the Canadian Embassy in Washington on November 2, 1951. (Agencies)