Save-the-date emails have been sent and preparations are under way as the countdown to King Charles's Coronation in May begins.
The final guest list is yet to be confirmed, but the attendees are certain to include an array of foreign royals, heads of state and politicians.
But one high-profile individual who will not attend is Joe Biden.
The US President confirmed to King Charles in a phone call that he would not be attending the Coronation and the US would instead be represented by his wife Jill, the first lady.
Despite the president’s decision not to attend, Washington has been at pains to deny that his absence was intended as a snub.
Meanwhile, Humza Yousaf, the new First Minister of Scotland, has said he will be attending – despite being a committed Republican and having promised to speak at an independence rally in Glasgow later on the same day.
Only a small minority of politicians and peers are expected to be invited and far fewer members of the aristocracy than the vast numbers that attended Queen Elizabeth II’s coronation in 1953.
While 8,000 guests crammed into Westminster Abbey for the late Queen's investiture, the guest list this year has reportedly been cut to around 2,000.
Here, we detail all the guests who are likely to attend the May 6 ceremony.
British Royal family
While King Charles's Coronation will be a slimmed-down event in comparison to 1953, nearly the entire Royal family will be out in force.
Members from across the family, including extended cousins and grandchildren, are expected to attend the ceremony at Westminster Abbey.
Even the youngest members of the family - including Prince Louis - are expected to be involved, posing a challenge for their parents about how to rein them in.
Prince George is to become the youngest future king to play an official role at a coronation, having been named one of his grandfather’s four Pages of Honour.
The nine-year-old will be tasked with carrying the King’s robes alongside three other Pages of Honour - schoolboys Lord Oliver Cholmondeley, 13, Nicholas Barclay, 13, and Ralph Tollemache, 12. All three are the sons of His Majesty’s friends.
The big question that remains is whether the Duke and Duchess of Sussex will attend.
While the couple have stated that they have been in correspondence with the King's office regarding the Coronation, they have not confirmed for certain whether they will attend.
A spokesman said: "An immediate decision on whether the Duke and Duchess will attend will not be disclosed by us at this time."
If either of them does attend, it is understood the visit will be brief. It is not thought that either Archie or his sister, one-year-old Lilibet, will travel to London for the ceremony.
Meanwhile, the Duchess of York also revealed at an event in New York earlier this month that she had not yet received an invitation. "I'm travelling at the moment, so maybe it [invitation] has gone to another place," she said.