The king’s coronation falls on the birthday of Archie, son of the Duke and Duchess of Sussex.
Archie, Charles’ grandson, will be four years old on Saturday May 6 next year when the King is crowned in great pomp at Westminster Abbey.
It has not yet been confirmed who will attend the ceremony and whether Harry and Meghan will be among those invited or if they can attend as it is their eldest child’s birthday.
More than 2,000 people will fill the abbey to see Charles and Harry’s stepmother, the Queen Consort, be crowned.
Buckingham Palace said the May 6 date was chosen in consultation with the Government, the Church of England and the Royal Household, but gave no further details as to why it was chosen.
It is not yet confirmed if there will be an additional public holiday to mark the occasion – a matter to be decided by the government.
Harry was going through tough times in his relationship with his father, telling US talk show host Oprah Winfrey he felt “really let down” by Charles, who stopped taking his calls in the run-up to the Megxit crisis, and like it to a “very hurt”.
The Duke later criticized Charles’ abilities as a father, criticizing him for expecting his sons to endure the pressures of royal life and suggesting that his parenting left him with “genetic pain and suffering”.
Meghan told Oprah that Archie was not given the title of prince because of his race.
However, when Archie was born seventh in line to the throne in May 2019, he was too far down the line to receive the title.
The Duchess also accused an unnamed member of the royal family of making a racist remark about Archie’s skin color before his birth.
Charles’ accession to the throne means Archie, who lives in California with Harry and Meghan and his year-old sister Lilibet, is now technically a prince.
But it has not been confirmed by the Duke and Duchess of Sussex or Buckingham Palace as to whether he will use the title of Prince or whether Lili will use that of Princess.
6 May was also the wedding anniversary of the late Queen’s sister, Princess Margaret, who married in 1960. Margaret divorced her husband, the Earl of Snowdon, in 1978.
The king’s grandfather, George VI, was crowned on May 12, 1937.
The ceremony also included the coronation of Charles’ beloved grandmother, Queen Elizabeth, later known as the Queen Mother.
Other famous May 6 birthdays include former Prime Minister Sir Tony Blair and actor George Clooney.
Other anniversaries include the death of Charles’ great-great-grandfather King Edward VII – the son of Queen Victoria – on May 6, 1910.
On May 6, 1954, Roger Bannister ran the first sub-four-minute mile on the Iffley Road course in Oxford in three minutes and 59.4 seconds.
In 1994, the Queen and France’s then-President Francois Mitterrand opened the Channel Tunnel, and Nelson Mandela and the ANC were confirmed victors in South Africa’s first post-apartheid elections.
In 1997, the Bank of England gained independence from political control, the most significant change in the bank’s 300-year history.
It’s also the anniversary of the births of the founder of psychoanalysis, Sigmund Freud, in 1856 and Italian silent film heartthrob Rudolph Valentino in 1895.