Who are the royal guests joining Queen Camilla for King Constantine's memorial service in Windsor?

The Royal Family turned out in force for the service of thanksgiving at Windsor Castle for the late King Constantine of Greece on Tuesday.

Queen Camilla, 76, led members of the Firm after King Charles III missed the sombre occasion as his treatment for cancer continues, while Prince William had been due to give a reading but pulled out for 'personal reasons'.

No further detail was given on William's absence, and it is not known if this relates to his wife, the Princess of Wales' ongoing recovery after her abdominal surgery last month. 

The Prince of Wales is understood to have called the Greek Royal family to apologise, while Kensington Palace confirmed Kate was 'doing well' as she recovers at home. 

Camilla was joined by Prince Andrew, his ex-wife Sarah, Duchess of York, their daughter Princess Beatrice, King Charles' sister Princess Anne, and her daughter Zara Tindall, as well as the late King Constantine's widow Queen Anne-Marie, their eldest son, Crown Prince Pavlos and other members of the Greek royal family.

Here, FEMAIL takes a closer look at the guests who attended the service... 

The Royal Family turned out in force for the service of thanksgiving (pictured) at Windsor Castle for the late King Constantine of Greece on Tuesday. Below, FEMAIL takes a closer look at the guests who attended the service...

1. Princess Alexandra, the Hon. Lady Ogilvy

Princess Alexandra, 87, is the daughter of the late Queen's uncle Prince George, Duke of Kent, and Princess Marina of Greece and Denmark. She is patron or president of over 100 organisations which reflect her wide-ranging interests, from the arts to health care. Although she is officially still a working royal, Princess Alexandra drastically reduced her workload last year.

2. Marina Ogilvy

Marina, 57, is a goddaughter of King Charles. She was married for seven years to photographer Paul Mowatt with whom she had two children. Famously pregnant before marrying Mowatt - in black - in 1990, she once posed for a magazine in a rubber jumpsuit and crown surrounded by corgis. It led to a fall out with her parents, Princess Alexandra and Sir Angus Ogilvy. They were reconciled and after her marriage ended she reverted to her maiden name. Today she is a teacher and musician.

3. Prince Andrew

Prince Andrew smiled and rubbed his hands together today as he walked the Royal Family into Windsor Castle for the service of thanksgiving in a move that proves he is 'back in the fold'.

In an extraordinary turnaround after he was banned from royal duties and stripped of his HRH and military titles by his mother the late Queen just two years ago, the Duke of York led The Firm into church to celebrate the life of the last King of Greece.

One royal watcher told MailOnline: 'Prince Andrew and the Yorks are firmly back in the fold'. 

It is the first time the Duke of York has attended a public event since the Christmas Day service at Sandringham. And it came almost two years to the day from when he settled the sexual assault case filed against him by Virginia Giuffre, a sex slave victim of Andrew's friend Jeffrey Epstein. 

The settlement was never disclosed but was estimated to be worth around £12million ($16.3million). It spared him having to give evidence under oath at any trial in the US and there were claims that the Queen helped him pay for it. Andrew has vehemently and repeatedly denied all allegations against him.

From left: Princess Alexandra the Honourable Lady Ogilvy, Marina Ogilvy, Prince Andrew, Duke of York and Birgitte, Duchess of Gloucester and Prince Richard, Duke of Gloucester

From left: Birgitte, Duchess of Gloucester, Prince Richard, Duke of Gloucester, Admiral Sir Tim Laurence and Queen Camilla and (second row left to right) Princess Beatrice, Edoardo Mapelli Mozzi and Sarah, Duchess of York, Lady Helen Taylor and the Duke of Kent

4. The Duchess of Gloucester 

Birgitte, Duchess of Gloucester, 77, is a full-time working member of the Royal Family. The Duchess of Gloucester travels extensively across the UK to undertake hundreds of engagements every year. Many are related to the more than 60 organisations with which she is connected, across the arts, the military, sport, health, welfare and education.

5. The Duke of Gloucester 

The late Queen Elizabeth II's cousin Prince Richard, the Duke of Gloucester, 79, is the son of the late Prince Henry, Duke of Gloucester. He carries out royal engagements on behalf of the Queen and has links to 150 organisations. Many of The Duke’s Patronages are related to architecture and conservation, both areas in which The Duke remains deeply interested. He joined the Royal Family on the balcony of Buckingham Palace yesterday.

6. Vice Admiral Tim Lawrence

Princess Anne's husband Vice Admiral Sir Timothy Laurence, 68, was seated next to his wife at the high profile occasion.  Despite not being a working member of the Royal Family, Sir Timothy often attends events to support his wife.

7. Princess Anne

Princess, 72, was seated on the front row between her husband and the Queen. The Princess Royal looked elegant in a black ensemble with matching hat. She is often dubbed the hardest working royal and, like many of the British royals, was close to the Greek royal family. 

Left to right: Queen Anne-Marie of the Hellenes, Crown Prince Pavlos of Greece, Crown Princess Marie-Chantal of Greece, Princess Alexia of Greece, Prince Nikolaus of Greece, Princess Theodora of Greece, Prince Philippos of Greece, Queen Sofia of Spain and Princess Irene of Greece

Queen Camilla was joined by her sister-in-law, Princess Anne

8. Queen Camilla

Queen Camilla took the reins as head of the Royal family on the world stage for the first time as she lead a memorial service for King Constantine of Greece.

She appeared calm and confident in an elegant pinstripe outfit as she stepped up as the most senior figure representing the British monarchy in Charles' absence.

King Charles III missed the service as his treatment for cancer continues, while Prince William had been due to give a reading but pulled out for 'personal reasons'.

9. Queen Anne-Marie of Greece

Queen Anne-Marie of Greece, 77, looks dignified as she mourned her husband.

The royal opted for a striped suit and pill box hat as she was joined by her family.

While Anne-Marie married into the Greek royal family, she is a Danish princess. Her father was Frederik IX of Denmark and her sister is Margrethe II, who abdicated at the beginning of this year.

She is connected to many royal families, including the Swedish royals, as her mother was Princess Ingrid of Sweden. Sweden's current king, Carl XVI Gustaf, is her first cousin. Her sister-in-law is Queen Sofía of Spain. 

From left: Queen Anne-Marie of the Hellenes, Crown Prince Pavlos of Greece, Crown Princess Marie-Chantal of Greece, Princess Alexia of Greece, Prince Nikolaus of Greece, Princess Theodora of Greece and Prince Philippos of Greece

 10. Crown Prince Pavlos of Greece

As the eldest son of the Constantine, Prince Pavlos is now the head of the Greek royal family, he was crown prince and heir apparent to the throne from birth until the monarchy's abolition.

Pavlos and his family split their time between the UK and US, as well as, of course, Greece. It's thought the couple are unlikely to move to Athens.

Pavlos and Chantal have lived between New York and London since 2004, with Marie Chantal running a children's clothing line out of the UK.

Together the family enjoy a life befitting of the world's mega wealthy, splitting their time between their stunning Upper East Side New York home and holidays around the world.

As well as the New York home, the Greek royals have four other properties around the world including a house in London, a Cotswolds estate, a holiday home in the Bahamas, as well as a country retreat in Yorkshire.

However it now appears they will be spending more time in Greece to support Anne-Marie, following the death of King Constantine.

11. Crown Princess Marie-Chantal of Greece

Marie-Chantal, 55,  today put on a dignified silence as she supported her husband mourning his father.

The British-born beauty has lived a modern-day fairytale, from growing up with billionaire father Robert Miller to falling 'in love at first sight' with Prince Pavlos, heir to the Greek crown.

She combines work as a clothes designer with a life as mother-of-five whose children are already forging their own successful paths.

She also has a huge online following, with nearly a quarter of a million fans on one social media channel alone.

Born in London on September 17, 1968, to parents Robert W Miller, 88, and his Ecuador-born wife Maria Clara Pesantas, 83, she was brought up in Hong Kong until the age of nine, where she then went to boarding school in Switzerland. 

12. Princess Alexia of Greece

Princess Alexia stood between her sister-in-law and younger brother as she mourned her father's death.

The 58-year-old is the oldest child of Anne-Marie and King Constantine but due to Greece's male primogeniture rules, her brother was the heir assumptive to the throne.

The mother-of-four, who married Spanish architect Carlos Morales Quintana,  mostly keeps out of the public eye.

(front row left to right) Princess Theodora of Greece, Prince Philippos of Greece, Queen Sofia of Spain and Princess Irene of Greece attend the thanksgiving service at Windsor Castle today 

(L-R) Princess Theodora of Greece, Prince Philippos of Greece, Queen Sofia of Spain and Princess Irene of Greece today

13. Prince Nikolaus of Greece

Another of Constantine's children, Nikolaos, 54, looked sombre at the service.

Nikolaus, is one of King Charles' godchildren and has lived a life in the limelight.

He followed his older brother Prince Pavlos into the Royal Scots Dragoon Guards and studied International Relations at Brown University, Rhode Island, before working for Fox News in New York. 

He dated supermodel Elle Macpherson and actress Gwyneth Paltrow before marrying an event planner in a wedding described as 'Mamma Mia with aristocrats'.  He now works as a landscape photographer in Athens.

14. Princess Theodora of Greece

The youngest daughter of the Greek royals is Princess Theodora, 40.

Like her younger brother Philippos, Theodora was born in London and now has a career in acting.  

15. Prince Philippos of Greece

The youngest child of Anne-Marie and Costantine is Prince Philippos, 37.

He was flanked by his sister and aunt today as he paid tribute to his father. 

Born in the UK, he is prominent in British and Greek society circles, and has been spotted at the weddings of Princess Eugenie, Edward Spencer-Churchill and Prince Napolean.

Princess Beatrice (left) and Edoardo Mapelli Mozzi at the service at Windsor Castle today

16. Queen Sofia of Spain

Queen Sofía of Spain is the sister of the late King Constantine and was the Queen of Spain until her husband Juan Carlos' abdication in 2014.

Her son Felipe is the current King of Spain.

Today she looked sombre as she put her head down and wrapped up in a blue coat. 

17. Princess Irene of Greece

Princess Irene, 81, is the other sister of Constantine. She live in Madrid with her sister and brother-in-law, King Juan Carlos.

18. Princess Michael of Kent

The wife of Prince Michael, Princess Michael of Kent, 79, is of German, Austrian, and Hungarian descent. She is actively involved in a number of different charities and organisations, including animal and wildlife trusts and health and welfare charities. She is, however, not a working member of the Royal Family.  

19. Prince Michael of Kent

Prince Michael of Kent, 81, is a son of Prince George, Duke of Kent, and Princess Marina of Greece and Denmark. Prince Michael is involved in around 100 charities and organisations, however he is not a working royal and does not carry out engagements on behalf of the King.

Princess Michael of Kent (left) and Prince Michael of Kent attend the service today

20. Princess Beatrice

Princess Beatrice, 35, looked elegant in a navy dress for the service, teamed with a matching headband. She was supported by her husband Edo, as well as her mother, the Duchess of York.

21. Edoardo Mapelli Mozzi

Princess Beatrice's husband Edoardo Mapelli Mozzi, 40, stayed by his wife's side as he supported her at the Service of Thanksgiving. The father-of-two shares daughter Sienna with the royal and has a son, Wolfie, from a previous relationship.

22. Sarah Ferguson

Sarah Ferguson was all smiles this morning as she joined Prince Andrew at the memorial service for the late King Constantine of Greece at Windsor Castle.

The Duchess of York, 64, still affectionately known to most as Fergie, was pictured arriving alongside her ex-husband, who she lives with at Royal Lodge in Windsor Great Park in Berkshire.

Sporting a black fascinator and grey outfit, the mother-of-two donned a pair of elegant earrings and opted for a smattering of glamorous makeup.

The service marks the Duchess' most high profile royal event in decades - with the mother of Princesses Beatrice and Eugenie rarely invited to Royal Family occasions following her high profile divorce from Andrew in 1996.

23. Lady Helen Taylor

A peripheral royal happy to lead a life largely under the radar, Lady Helen is the daughter of the Duke and Duchess of Kent. She was a fashion ambassador and muse to Giorgio Armani for 17 years. 

24. Prince Edward, Duke of Kent

Prince Edward, Duke of Kent, 88, is the son of Queen's uncle Prince George, Duke of Kent, and Princess Marina of Greece and Denmark. Although he is officially still a working royal, the Duke of Kent has scaled back his responsibilities due to mobility issues.

25. Princess Olympia of Greece

Princess Olympia of Greece and Denmark is the goddaughter of King Charles and a highly sought-after model, gracing the runway for the likes of Dolce & Gabbana. She was born in New York City and is the oldest child and only daughter of Pavlos, Crown Prince of Greece, and Marie-Chantal Miller.

(front row left to right) Princess Olympia of Greece, Prince Achilleas of Greece, Carlos Morales and Princess Tatiana of Greece joined by (second row left to right) King Felipe of Spain, Queen Letizia of Spain, King Juan Carlos of Spain and Princess Benedikte of Denmark at Windsor today

(left to right) Queen Anne-Marie of the Hellenes, Crown Prince Pavlos of Greece, Crown Princess Marie-Chantal of Greece and Princess Alexia of Greece attend the service today

26. Prince Achilleas of Greece

Prince Achileas-Andreas of Greece is the son of Marie-Chantal and Pavlos, the Crown Prince and Princess of Greece.

He attended New York University after his family moved to America when he was a teenager. He has largely grown up away from the spotlight but is now a fledgling actor - appearing in US soap opera The Bold and the Beautiful alongside his aunt Princess Theodora. 

He offers his Instagram followers a glimpse into his jet-setting, lavish life, posting snaps from his trips around the world with his group of friends - which includes Princess Beatrice. 

27. Carlos Morales

Carlos Morales is a Spanish architect married to Princess Alexia of Greece, the oldest child of Queen Anne-Marie and King Constantine. The couple mostly keeps out of the public eye. 

28. Princess Tatiana of Greece

Princess Tatiana of Greece, 43, is married to the late King Constantine’s son Prince Nikolaos. Venezuelan-born Tatiana gave up her job as an events’ organiser for designer Diana Von Furstenberg soon after she married in 2010. 

29. Mr Matthew Kumar

LA-based lawyer Matthew Kumar started dating Princess Theodora of Greece in 2016, before getting engaged to one another in 2018. He was born and raised in Southern California to Sam and Lonnie Kumar.

30. Princess Nina of Greece

Princess Nina of Greece is the wife of Prince Philippos of Greece. She is the daughter of Swiss businessman Thomas Flohr, who founded private jet charter company VistaJet, where she also works as a creative director.

Nina, who was a guest at Princess Eugenie’s wedding to Jack Brooksbank in October 2018, founded the nonprofit marine research facility, the Bazaruto Center for Scientific Studies (BCSS), in 2017.

31. Prince Aristides of Greece

Prince Aristidis-Stavros, 15, is the the youngest child of Pavlos and Marie-Chantal. He was born on June 28, 2008, in Los Angeles. 

32. Prince Odysseas of Greece

Prince Odysseas-Kimon of Greece and Denmark is the second youngest child of Crown Prince Pavlos and Crown Princess Marie-Chantal of Greece. The 18-year-old is studying at New York University, in Manhattan. 

33. María Clara Pesantes Becerra

María Clara Pesantes Becerra is the mother of Crown Princess Marie-Chantal of Greece. She is an Ecuadorian of humble origins, who moved to New York in 1959, when she changed her name to Marie Chantal, according to Spanish magazine Vanidades. 

(front row, left to right) Princess Alexandra the Honourable Lady of Ogilvy, Marina Ogilvy, Prince Andrew, the Duchess of Gloucester, the Duke of Gloucester, Admiral Sir Timothy Laurence, the Princess Royal and Queen Camilla at St George's Chapel in Windsor today

34 & 35. Mr. and Mrs. James Ogilvy

Landscape architect James Ogilvy, 59, is the elder child and only son of Princess Alexandra, the Hon. Lady Ogilvy and the late Angus Ogilvy. He is also an accomplished photographer. Meanwhile, author Julia Ogilvy, 59, is the wife of James Ogilvy. The couple share two children. 

36 & 37. Earl and Countess of St. Andrews

The Earl of St Andrews, a former diplomat, is the elder son of Prince Edward, Duke of Kent, and his wife, Katharine, Duchess of Kent. The father-of-four attended with his wife Sylvana Tomaselli. 

38. Daniel Chatto

Former actor Daniel Chatto, 66, is the husband of Sarah Chatto and stays largely out of the spotlight. The couple married in 1994 and share two sons, Samuel and Arthur. 

39. Lady Sarah Chatto

Princess Margaret's daughter Lady Sarah Chatto looked elegant in a navy coat and black dress as she arrived at Windsor Castle today alongside other members of the Royal Family. She was close to her late aunt, Queen Elizabeth II, and once referred to her as a second mother. 

40. Mike Tindall 

Ex-England rugby player Mike Tindall, 45, is the husband of Zara Tindall. The couple share three children and live on Princess Anne's Gatcombe estate, in Gloucestershire. Mike has a close relationship with Zara's family, particularly her brother and cousins.

41. Zara Tindall

Zara Tindall, 42, is Princess Anne's younger child and only daughter. The accomplished equestrian walked alongside her husband, mother and stepfather, Vice Admiral Sir Tim Laurence, as they attended the memorial service for the cousin of King Charles. She opted for a navy coat dress and hat for the service.

42. King Felipe of Spain

King Felipe VI of Spain, 56, is the nephew of the King Constantine, through his mother, Queen Sofia.

Felipe, is also close to the British royal, he ascended the throne in 2014 upon the abdication of his father King Juan Carlos, and referred to the Queen and Duke of Edinburgh as 'dear aunt Lilibet' and 'dear uncle Philip'.

The familiarity between the British and Spanish royal households is due to centuries-old family ties. Felipe's maternal great-grandfather, King Constantine I of Greece (1868 - 1923), was the older brother of Prince Philip's father, Prince Andrew of Greece and Denmark. 

43. Queen Letizia of Spain

She met Felipe, in 2002, Letizia was working for popular TV channel 24 Horas, where along with anchoring the popular Telediario 2 evening news bulletin she reported on a wide range of breaking news event. 

The queen comes from humble beginnings. Born on September 15, 1972, in Oviedo, northern Spain, Letizia grew up in a middle-class family and attended a public school. 

While her mother, Maria Rodriguez, was a nurse, Letizia took after her father, Jesús José Ortiz Álvarez, and stepmother Ana Togores, who are both journalists, and studied communications at university in Madrid.

44. King Juan Carlos of Spain

King Juan Carlos is the former King of Spain and brother-in-law of King Constantine.

No longer the monarch, styling himself as Rey Emerito or King Emeritus instead, the 85-year-old lives not in Madrid's Zarzuela Palace but in exile in the United Arab Emirates.

Effectively forced to abdicate in 2014, Juan Carlos finds himself surrounded by allegations of financial impropriety - although nothing has been proved against him - and still faces a multi-million pound lawsuit from a former mistress.

Such is the controversy surrounding the former king that when, in October, his granddaughter Leonor, heir the the throne, reached her 18th birthday and swore fealty to the Spanish constitution, Juan Carlos was not invited to the public ceremony, only the family gathering afterwards. 

45. Princess Benedikte of Denmark

Princess Benedikte of Denmark represented the Danish royals at the memorial today.

The sister of Queen Margrethe of Denmark, Benedikte, 79, is a working royal and the sister-in-law of King Constantine, through her sister Queen Anne-Marie.

She was married to Richard, 6th Prince of Sayn-Wittgenstein-Berleburg until her death in 2017. Her children joined her at the service. 

Princess Maria-Olympia of Greece, Prince Achilleas of Greece, Carlos Morales and Princess Tatiana of Greece joined by (second row L-R) King Felipe of Spain, Queen Letizia of Spain, King Juan Carlos of Spain and Princess Benedikte of Denmark

46. Princess Alexandra of Greece

Princess Alexandra of Greece is a second-cousin of King Constantine. 

She is the daughter, Prince Michael of Greece and Denmark who was Prince Philip's first cousin.

47. Prince Alexander of Serbia

Prince Alexander of Serbia, was joined by his wife, Crown Princess Katherine, at the service today.

His mother, Alexandra of Yugoslavia, who died in 1993, was a first cousin of King Constantine and a relative of the Prince Philip.

The pretender to the throne was born and raised in the UK and has a close relationship with his British cousins.

He recently revealed he 'only recently defeated prostate cancer' after admitting he was encouraged to speak up by King Charles' 'openness'.

In a shock statement, the 78-year-old, who is cousin to the British monarch, 75, disclosed that he was diagnosed with prostate cancer in December last year.

He previously kept his battle with the illness under wraps, but Charles' 'openness' about his own cancer diagnosis inspired him to speak out.

The 78-year-old said he was 'terrified' at the time of diagnosis, but the support of family and friends helped him through the struggle. Alexander has since received the 'all clear' from doctors.

He concluded the message by sending well wishes to his 'dear friend and cousin' Charles and expressed his 'high hopes' that the monarch will also be 'triumphant' in recovery.

48. Crown Princess Katherine of Serbia

Katherine Karađorđević, 80, is the wife of Prince Alexander.

She was born in Athens and grew up between Greece and Switzerland.

King Constantine was the best man at their wedding. 

49 & 50.  Infanta Cristina of Spain and Infanta Elena of Spain

King Felipe's sisters, Infanta Cristina and Infanta Elena came to mourn their uncle today.

Sat side-by-side, they supported their cousins.

Cristina finalised her divorce. The 58-year-old parted ways with Iñaki Urdangarin 56, after he was caught on camera holding hands with another woman in January 2022.

The mystery woman was revealed as one of Iñaki's co-workers at Imaz & Asociados law firm, Ainhoa Armenia, and a week later Cristina and her husband released a joint statement to say they were separating. 

Elena recently celebrated her 60th birthday with her family.  

(left to right) Lord Cavendish of Furness, US climate envoy John Kerry and Dame Norma Major at Windsor Castle today

51. Lord Cavendish of Furness

Hugh Cavendish, Baron Cavendish of Furness is a member of the House of Lords and owner of the 17,000 acre Holker Hall in Cumbria. 

The Tory Peer is head of the Cavendish family a long-running noble family.

52. John Kerry

US climate envoy John Kerry represented the US at the event.

The Democratic party heavyweight chatted to  Dame Norma Major and Lady Susan Hussey.

53 & 54. Dame Norma Major & Sir John Major

Former British Prime Minster Sir John Major, 80,  who held the premiership from 1990 to 1997, was joined by his wife Norma.

Penelope Knatchbull, Countess Mountbatten of Burma (centre) and Zara Tindall at Windsor

55 & 56. Thomas Hooper & Alexandra Knatchbull

Alexandra Knatchbull, a close family friend of the royals, was joined by 

Alexandra, 41 , is the daughter of Lord and Lady Brabourne and the great granddaughter of the late Lord Mountbatten,with whom King Charles had an exceptionally close bond while growing up.

Alexandra is the second goddaughter of Diana, Princess of Wales, and was left a legacy in the Princess's will when she died in 1997.

The Queen and Prince Philip attended her marriage to Thomas in 2016 at Romsey Abbey in Hampshire - dubbed the society wedding of the year - along with Princess Anne and Prince Charles.

57. Penelope Knatchbull

Penelope (Penny) Knatchbull, also known as Countess Mountbatten of Burma, who befriended Prince Philip at a polo match in 1975 when she was 20, became one of his closest confidantes despite being 32 years his junior and was pictured on walks with the Duke over the years. 

Also known as Lady Romsey and Lady Brabourne, Penny bonded with the late Philip over their shared love for the equestrian sport of carriage-driving. 

When she met the Duke, Penny was in a relationship with Earl Mountbatten's grandson Norton Knatchbull, whom she eventually married.

Queen Noor Al-Hussein of Jordan sat next to Prince Gustav zu Sayn-Wittgenstein-Berleburg

58. Queen Noor Al-Hussein of Jordan

Queen Noor was married from King Hussein from 1978 until his death in 1999. Together the couple had four children: two daughters and a son. Princess Raiyah is the youngest of the four children. All of her siblings have children.

Queen Noor, 60, is now the Queen Dowager of Jordan. An accomplished and highly educated businesswoman and advocate, Queen Noor now splits her times between homes in Jordan, Washington D.C. and the UK.

She is thought to have two British properties in London and her country residence, Buckhurst Park, near Winkfield in Berkshire.

59 & 60. Prince Gustav zu Sayn-Wittgenstein-Berleburg & Princess Carina zu Sayn-Wittgenstein-Berleburg

Prince Gustav of Sayn-Wittgenstein-Berleburg is the nephew of Denmark's Queen Margrethe and Greece's Queen Anne-Marie.

He married his partner of 19 years, Carina Axelsson, in Germany 2022 and they announced they'd welcomed a baby son using a US surrogate in June 2023.

Gustav and Carina spent years fighting a strict inheritance rule set by the Prince's Nazi grandfather in the 1930s, which prevented them from tying the knot.

Princess Benedikte's son Gustav and Carina were banned from marrying as a result of a legal clause set by the royal's grandfather Prince Gustav Albrecht.

In the 1930s, he set up his will to prevent relations from inheriting family property if they marry someone not of Protestant, noble and Aryan descent.

By 1944, he went missing while serving as an officer in the German Army, during a mission near Orsha, Belarus. The soldier was declared MIA and no one sought an official declaration of death until Gustav was born in 1969.

Gustav's father Prince Richard was able to inherit property because his wife - Princess Benedikte of Denmark - met the strict and controlling criteria.

However, Carina Axelsson, 54 - who is an American author best known for the teen fashion detective series Model Under Cover - has Swedish and Mexican heritage, and hence didn't satisfy the will's agenda.

But in 2020, German courts decided Gustav met the conditions of the will - and could inherit Berleburg Castle, where he and his wife married in front of 80 guests, including King Frederik and Queen Mary of Denmark.

61 & 62. Princess Alexandra zu Sayn-Wittgenstein-Berleburg

Princess Alexandra zu Sayn-Wittgenstein-Berleburg & Count Michael Ahlefeldt-Laurvig-Bille

Princess Alexandra zu Sayn-Wittgenstein-Berleburg is the first daughter and second of three children of Prince Richard of Sayn-Wittgenstein-Berleburg and Princess Benedikte of Denmark. On 18 May 2019, Alexandra married Count Michael of Ahlefeldt-Laurvig-Bille.

63. Prince Kyril of Preslav

Born in 1964, Kyril is the second son of King Simeon II, also known as Simeon Saxe-Coburg-Gotha, who had served as the last reigning Tsar of Bulgaria from 1943 to 1946, before later serving as Prime Minister of Bulgaria from 2001 to 2005.

Simeon is a fourth cousin of the late Queen's father, George VI, and attended the 2011 wedding of the Duke and Duchess of Cambridge.

In September 1989, Kyril married María del Rosario Nadal y Fuster de Puigdorfila, also known as Rosario Nadal, the daughter of Miguel Nadal y Pestard, a Balearic Islands industrialist. They separated in 2009.

Kyril is now dating British businesswoman and art historian Katharine Butler, a former University of Edinburgh professor and daughter of British diplomat Sir Michael Butler.  

64 & 65. Prince Hassan Bin Talal of Jordan & Princess Sarvath El Hassan of Jordan

Old Harrovian Prince Hassan of Jordan, the uncle of the reigning King Abdullah II, and his wife Princess Sarvath, were friends of the late Queen Elizabeth II. The Princess has been a guest of the Royal Family at Ascot and was given the honour of riding in a carriage with Princess Anne.

66. Prince Constantijn of the Netherlands

Prince Constantijn of the Netherlands, 54, is the younger brother of the reigning King Willem-Alexander. He studied law at university and has gone on to work for think-tanks and charities in Brussels and London. 

In 2017, he and his wife Princess Laurentien set up the Number 5 Foundation, a charity which is currently developing various innovatory initiatives to address a range of social issues.

He rarely attends public events in his capacity as a member of the Dutch Royal House, but makes a yearly appearance at Prinsjesdag - or Prince's Day - each September.