It may be the Coronation of King Charles and Queen Camilla - but the historical event is set to be a real family affair for the royals.
Nearly all are expected to be invited and attend - with some members of the Firm believed to be given important roles during the Westminster Abbey service on May 6 with hopes they will be dressed in all of their finery.
So far, few details have been released about the spectacle - although we now know that Camilla will use Queen Mary's Crown for the ceremony and that it is set to be a smaller and shorter event than the last Coronation in 1953.
It is also believed that Prince Harry and Meghan Markle - the King's estranged son and daughter-in-law will definitely be invited - although a question mark remains over their attendance.
But if they do attend what can we expect from them? Will the Princess of Wales play any role? And will we see Prince George, Princess Charlotte and Prince Louis there?
Here we talk to author and historian Dr Tessa Dunlop to get her thoughts on what roles the royals other than Charles and Camilla will have at the Coronation - and what we can expect to see from them on the big day....
Prince Harry and Meghan Markle
One of the biggest issues that needs to be cleared up before the Coronation is whether Harry and Meghan will attend.
It is understood they are on the guest list but Harry's bond with his father has been on extremely shaky ground with him and Meghan making several allegations about the royals in an interview with Oprah Winfrey and a docuseries on Netflix.
Meanwhile, last month Harry released his controversial memoir Spare, where he alleged William physically attacked him and claimed he begged Charles not to marry his wife Queen Consort Camilla.
And according to Tessa, if they do attend - don't expect them to play much of a role in the ceremony.
She told the Mirror "Causing maximum angst is the vexed question of the Sussexes; will they attend the big day and if so in what capacity? Historical precedent doesn't bode well.
"After his own abdication and fall from grace Edward VIII attended neither the 1937 coronation of his brother George VI nor his niece Elizabeth's in 1953.
"However in our changed times with a father-King who wants both his sons by his side, expect to see Harry there but minus a coronet and robe.
"With the exception of Prince William, at this Coronation peers of the realm will not be paying homage to the new King so it is unlikely that Harry will have to go down on bended knee.
"Likewise if Meghan attends, any Coronation finery will be entirely her own. Expect very few to stand on ceremony for the Duchess of Sussex."
Prince William and Kate Middleton
However, in stark contrast to Harry and Meghan will be the Prince and Princess of Wales, who are now the future King and Queen.
William, as heir to the throne, will reportedly pay homage to his father the King during the ceremony, which will see him kneel and pledge allegiance to Charles as well as touching the crown and kissing the monarch's right cheek.
Tessa added: "In contrast history suggests working royals will stand out.
"In 1953 the Queen’s sister Princess Margaret had her own coronation gown designed by Norman Hartnell, embroidered with roses and daisies and offset with a stunning Cartier tiara.
"She travelled to the Abbey with the Queen Mother and they sat in a box overlooking proceedings with a four-year-old Prince Charles squashed between them.
"A similar scenario for the Princess of Wales and her three children is likely – William and his offspring are next in line to the throne and coronations deliberately emphasise the order of precedence and succession.
"Like it or not this state occasion is all about royal hierarchy. Visual messaging through both costume and carriage will remind us who the future King and Queen are (whether the Sussexes like it or not!)"
Prince George, Princess Charlotte and Prince Louis
So with William and Kate definitely attending, it is likely their children Prince George, Princess Charlotte and Prince Louis will also be there.
And according to Tessa, history points to the children also being seen in their finery alongside the adults.
She explained: "The idea of Prince George as a cherub-like page boy or indeed Charlotte as a maid of honour is too good to be true but would signal a break with precedent.
"Nine-year-old George isn't too young - the 12th Duke of Devonshire was page boy to the Mistress of Robes at that age for the 1953 coronation.
"But George is directly in line to the throne so unlikely to be given what is effectively a servile role – albeit it an exceptional one.
"While he won't be carrying Grandpa's train, George alongside siblings Charlotte and Louis will be a big visual pull at the coronation – just as Prince Charles was at his mother's.
"Expect Charlotte in a dainty coronet [small crown] - perhaps even the one the late Queen wore to her father's coronation aged 10 - and the two brothers in frock coats and breeches.
"Kate loves dressing up her children, so objections are unlikely. And the money shot everyone will want is a snap of the three siblings in their finery alongside the King and the Queen on Buckingham Palace balcony after the service."
Princess Anne, Prince Edward and Sophie Wessex
But who else will be in for a balcony appearance? According to Tessa, it looks like the King's siblings Princess Anne, Prince Edward and his wife Sophie Wessex will be - but Prince Andrew will not.
She added: "Other working royals may appear on the balcony, including Anne (she suits a tiara) and Edward and Sophie of Wessex.
"Maids of honour and page boys historically also get a look in but don’t expect to see anyone who doesn’t have an official role. The chances of Harry or Andrew waving down from on high are slim!
"Beyond a glitzy Westminster Abbey service and coronation procession, the inner core of Royal stalwarts will also be on hand to placate the rest of the country – don't be surprised if a peripatetic Princess Anne or Prince Edward visit a town near you in the run-up to the big day.
"After all this is the people’s Coronation and most of us don't live next door to Buckingham Palace."
Tessa Dunlop will be talking about her new book 'Elizabeth and Philip' at Portsmouth Literary Festival, Portsmouth Central Library, 7 pm on Friday, February 24.
