Prince Philip's death during a time of coronavirus restrictions means the plans that had been laid down for many years for his funeral had to be all but ripped up and rewritten.
Rather than a grand funeral attended by hundreds of people including the wider Royal Family, political figures and foreign dignitaries, there will be a small event attended by 30 people, in line with government guidelines.
Boris Johnson ruled himself out of the group, to allow more family members to attend.
Watch: Prince Philip's funeral - the planned procession to St George's Chapel
Plans for his funeral have been kept secret for many years under the code name Operation Forth Bridge.
Here are the royals who might be attending.
Queen Elizabeth II
Queen Elizabeth II has been widowed at 94 after losing her husband of more than 70 years.
The pair married in Westminster Abbey in 1947, shortly after the Second World War, and had four children, eight grandchildren and 11 great-grandchildren together.
Elizabeth called Philip her "strength and stay" and he was a significant support to her throughout her reign.
She will sign off on his funeral plans and lead the family in mourning.
The longest-serving consort, Philip racked up tens of thousands of royal engagements during his decades by the side of the Queen.
His death triggers her personal time of mourning, which will include an eight-day period where no parliamentary bills will be given royal assent.
She'll remain in mourning, carrying out duties behind closed doors, for about 22 days after his funeral.
Prince Charles and Camilla
Prince Charles may have had a rocky relationship with his father as a young man, but the pair were often seen laughing and joking together as they got older, at family events and celebrations.
Charles is sure to have an important role in supporting his mother over the next few weeks and months, having picked up his royal duties with her when his father retired in 2017.
He and his wife Camilla, who became a firm part of the family, will be there to pay their respects.
Camilla, the Duchess of Cornwall, took over one of Philip's roles as Colonel-in-Chief of The Rifles in 2020, showing their much improved relationship.
The Duke and Duchess of Cambridge – but no children
Prince William and Kate will be attending, but it's been reported that their children Prince George, Princess Charlotte and Prince Louis will not be there.
The children are only seven, five and two, and the Daily Telegraph reported they would be kept at home. This could be to shield them from public pressure at an early age.
William said he was "so proud" of his grandfather in January 2021 when he received the coronavirus vaccine.
He was supported by his grandfather after the death of his mother in 1997, when Philip walked with William and Harry behind the coffin of Diana at her funeral.
It is reported that William will be one of those to walk behind the coffin.
Prince Harry, but no Meghan
Prince Harry arrived back in the UK on 12 April, ahead of the funeral on 17 April.
He will have to quarantine at a prearranged address while in the UK, but there are exemptions provided for those who are attending funerals.
He will have to return two negative COVID tests during his quarantine period, though the second one would be required on day eight of the period, which will actually be after the funeral.
He could take a private test on day five from a government-approved supplier and then be allowed out of quarantine early.
Meghan, Harry's wife, was not able to accompany him to the funeral because she is pregnant and could not get medical clearance to fly.
Watch: Prince William and Prince Harry to walk behind Prince Philip's coffin at funeral
Since leaving their senior-royal roles, the couple started a production company, and make documentaries, scripted series and children’s shows for Netflix.
They also run a non-profit organisation called Archewell.
The Princess Royal, Prince Philip's only daughter, will be also in attendance, paying tribute to the man she called her "teacher" "supporter" and "critic" in a message on Instagram after his death.
She also said: "It is his example of a life well lived and service freely given that I most wanted to emulate."
Anne has regularly been one of the hardest-working royals in the family, frequently clocking up hundreds of engagements each year.
She and her father were said to be close throughout her childhood, sharing similar values and personality traits. Her father once said of her: "If it doesn't fart or eat hay, she's not interested."
Anne will be accompanied by her husband, Vice Admiral Sir Timothy Laurence.
Prince Andrew, Prince Philip's second-oldest son, has largely been out of sight since he stepped back indefinitely from royal duties in 2019 over the fallout of his friendship with disgraced financier Jeffrey Epstein.
But he appeared on television on the Sunday after his father's death, having been to church that morning. He paid tribute to him outside and thanked the public for their support.
Andrew was a frequent visitor to sex offender Epstein’s New York home and allegations were levelled against him by a woman who claimed to be a sex-trafficking victim.
The Duke of York denied all allegations and no charges have been brought against him, though the FBI wants to speak to him as a witness.
Andrew may be forced to stay away from most royal events, but he would be unlikely to accept missing his father’s funeral.
The Wessex family
Prince Edward and his wife Sophie, Countess of Wessex, will be in attendance with their children Louise and James.
The family were particularly close to the Queen, and their close proximity to Windsor Castle mean they are able to see her frequently so they will want to offer her support at this time.
It's previously been reported that Edward will take on the title of Duke of Edinburgh when Prince Philip died. However it was confirmed after Philip's death that the title has been passed to Prince Charles, who will recreate it when he accedes to the throne and pass it to his brother then.
Watch: Prince Philip and the Queen's marriage
Edward and Sophie started life as working royals in 2002, during the Queen’s jubilee year. They increasingly came to the forefront of the family when Andrew had to step back and Harry and Meghan moved to the US.
Their children are unlikely to take on royal duties but they will be regulars at royal events, including the funeral.
Princess Beatrice and Edoardo Mapelli Mozzi and Princess Eugenie and Jack Brooksbank
The children of Prince Andrew will also attend the funeral, though it’s not as clear if their mother Sarah Ferguson will be there.
However, the attendance of their husbands is now in question because of the numbers allowed at the ceremony.
Beatrice is married to property developer Edoardo Mapelli Mozzi, who she wed in a secret ceremony during the coronavirus pandemic. He has a son, Wulfie, who is unlikely to attend.
Eugenie is married to tequila brand ambassador Jack Brooksbank. They married in a grand ceremony in Windsor in October 2018.
Eugenie and Jack have one son, August, but he will probably stay at home for the funeral.
Neither princess carries out royal duties, but do have private charities they are patrons of. The princesses have previously spoken about their royal grandparents with great affection.
The Phillips family
Peter Phillips, Anne’s son, will be in attendance. He is divorced, and the attendance of his former wife Autumn Phillips is not certain now either.
They have two daughters, Savannah and Isla Phillips. With their cousins, the Cambridge children, unlikely to attend, it's less likely that they would go.
Phillips and his family don't have royal titles, but retain places in the line of succession.
The Tindall family
Princess Anne’s daughter Zara Tindall and her husband Mike will be at the funeral.
They have three children: daughters Mia and Lena and son Lucas.
The couple don't have royal titles but they are still a part of the Royal Family and are seen at events like Trooping the Colour.
The Viscount Linley
David Armstrong-Jones, the Viscount Linley, is the son of Princess Margaret, the Queen’s younger sister.
He is divorced from his wife Serena, the Viscountess Linley, but the length of their marriage prior to that could indicate she will still attend Prince Philip's funeral. They were both present at the Queen Mother’s funeral in 2002.
They have two children, Charles and Margarita, who may also attend the funeral. The family have been regulars at the Queen’s Christmas lunch, which she hosts at Buckingham Palace.
With the shrinking guest list, Serena, Charles and Margarita may find they are cut from the list.
Lady Sarah and Daniel Chatto
Lady Sarah is the daughter of the late Princess Margaret. She is married to Daniel Chatto, an actor.
They both attended the funeral of the Queen Mother in 2002.
They have two children, Arthur and Samuel, who are considered an important part of the family.
Arthur, was a page of honour for the Queen for six years, meaning he held a position in state occasions, carrying the train of her dress.
In a COVID-restricted funeral, it could be just Lady Sarah and Daniel who are invited.
The Duke and Duchess of Gloucester
The Queen’s cousin the Duke of Gloucester and his wife will likely be in attendance. They have been working royals for decades, having come to their roles suddenly when the duke’s older brother died.
They represent hundreds of charities and carry out numerous engagements throughout the years.
They are likely to continue supporting the Queen as she continues and could be at the funeral to pay their respects to Prince Philip.
They have three children: Alexander Windsor, Lady Davina Windsor and Lady Rose Gilman.
Alexander, who is the Earl of Ulster, has three children, while Lady Davina and Lady Rose have two each.
The Duke and Duchess of Kent
The Duke of Kent is another of the Queen’s cousins, and he and his wife Katherine, Duchess of Kent, will attend.
He carries out royal duties, and will want to offer support to the Queen and pay respects to Prince Philip.
Katherine has been out of the public eye for many years, having decided to retire from royal duties in 2002 and stop using her HRH style. She became a music teacher at a school in Hull, where she was simply Mrs Kent.
They have three living children and 10 grandchildren, some of whom may be in attendance at the funeral.
Their children are George Windsor, Lady Helen Taylor and Lord Nicholas Windsor. The duchess had a stillborn son in 1977 called Patrick.
Another of the Queen’s cousins, Princess Alexandra is a working royal who will want to attend the funeral.
She was widowed in 2004, after being married to Sir Angus Ogilvy for more than 40 years. They had two children, Marina and James, who could accompany their mother on the important occasion.
Marina is married to Paul Mowatt and they have two children Zenouska and Christian. James is married to Julia Ogilvy and they have two children too, Flora and Alexander.
Princess Anne was Alexandra’s chief bridesmaid when she married Ogilvy, demonstrating a close bond between the cousins.
Prince and Princess Michael of Kent
Prince Michael is another cousin of the Queen, and he and his wife Princess Michael of Kent have been regular attendees at royal events but don’t carry out engagements.
They live in an apartment in Kensington Palace, which the Queen paid their rent on for some time after outrage that they were living there for free.
The couple have two children: Lord Frederick Windsor and Lady Gabriella Kingston. Lord Windsor is married to Sophie Winkleman, and Lady Kingston is married to Thomas Kingston.
Their children would likely have joined them at the funeral in normal times, but in this COVID era it's less likely they would be on the list.
Lady Pamela Hicks
Lady Pamela Hicks is a first cousin of the late Duke of Edinburgh, and was a bridesmaid for then-Princess Elizabeth at her wedding in 1947.
Lady Pamela was then a lady-in-waiting for Princess Elizabeth.
She is a widow and has three children, perhaps the most famous of whom is India Hicks. Prince Charles is Hicks's godfather, so the families remain close.
Lady Pamela is 91, but recently shared her memories of the Queen in a new documentary and could be there to offer support.
Brigadier Archie Miller-Bakewell
The prince's private secretary Brigadier Archie Miller-Bakewell is likely to be on the guest list.
He had worked for the Duke of Edinburgh for 11 years.
Who might be cut?
The list of attendees has not been finalised but there are several royal names who would have wanted to attend but may find themselves cut from the list.
These royals are part of the wider family and often attend events like weddings and Trooping the Colour.
The Earl and Countess of Ulster
Alexander Windsor is the only son of the Duke and Duchess of Gloucester. The Duke is a cousin of the Queen.
He is married to Claire Booth and they are known as the Earl and Countess of Ulster.
They have two children, a son called Xan and a daughter called Cosima, who have been on the balcony for Trooping the Colour but might be too young to attend the funeral.
The earl has a military background but now works in non-governmental roles.
The Earl and Countess of St Andrews
George Windsor and Sylvana Palma Windsor are known as the Earl and Countess of St Andrews.
He is the oldest son of the Duke of Kent, and a former diplomat who now works with several charities.
The couple have three children.
Lord Downpatrick, Lady Marina, Lady Amelia Windsor
The Duke and Duchess of Kent’s three children would have been on a longer funeral guest list. As non-working royals, they are regular attendees at events like Trooping the Colour.
Lady Amelia Windsor is the most recognised of the three children, thanks to her career as a model.
Lady Marina and Lord Downpatrick have both forfeited their places in the line of succession as they were confirmed in the Roman Catholic Church.
Lady Marina also has a modelling past, while Edward Windsor, who is the Lord Downpatrick, is a fashion designer.
Lord and Lady Frederick Windsor
The son of Prince and Princess Michael of Kent, Lord Frederick Windsor would have come with his wife Sophie Winkleman.
They are regulars at royal events like weddings and the annual Christmas lunch.
While their children attend celebratory engagements, they might have been deemed too young for the funeral even without the restrictions. Daughter Maud was a bridesmaid for Lady Gabriella in 2019.
Lady Gabriella Kingston and Thomas Kingston
The daughter of Prince and Princess Michael of Kent, Lady Gabriella would have wanted to be there with her husband Thomas Kingston.
They were married in 2019 in St George's Chapel, and the Queen and Prince Philip attended the celebration.
She’s a freelance journalist and in 2020 released her first single.
The couple don’t yet have children.
Watch: Queen left with ‘huge void in her life’ says Prince Andrew