Details of the Duchess of Kent’s funeral have been revealed as King Charles III and Queen Camilla prepare for the first Catholic ceremony for a Royal in modern British history.

Katharine died peacefully at home, surrounded by her family, aged 92 on September 4.

She had become the first member of the royal family to convert to Catholicism for more than 300 years, doing so in 1994, and it was her wish to have her funeral at Westminster Cathedral.

And in keeping with Roman Catholic tradition, her coffin will travel from Kensington Palace to the cathedral on Monday, a day before the main service, for a series of private funeral rites attended by the Duchess’s immediate family.

It will be led by a military piper from The Royal Dragoon Guards, a regiment the Duchess supported as deputy Colonel-in-Chief since its inception in 1992, for the first few minutes of the journey.

Other service personnel from the regiment will form the bearer party carring the coffin into the cathedral where it will rest overnight in the Chapel of the Blessed Virgin Mary.

Tuesday’s requiem mass will be attended by the King, Queen and other senior royals.

The last Catholic royal was King James II, who reigned from 1685 until he was deposed by his daughter Mary II and her Dutch husband William III of Orange in the Glorious Revolution of 1688.

Details of the Duchess of Kent's funeral have been revealed (Pictured: The Duchess on a 1991 red carpet)

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Details of the Duchess of Kent’s funeral have been revealed (Pictured: The Duchess on a 1991 red carpet)

King Charles III and Queen Camilla, pictured last week, are preparing for the first Catholic ceremony for a Royal in modern British history
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King Charles III and Queen Camilla, pictured last week, are preparing for the first Catholic ceremony for a Royal in modern British history

She had become the first member of the royal family to convert to Catholicism for more than 300 years, doing so in 1994 (Pictured: the Duchess of Kent on her wedding day in June 1961)
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She had become the first member of the royal family to convert to Catholicism for more than 300 years, doing so in 1994 (Pictured: the Duchess of Kent on her wedding day in June 1961)

The Act of Settlement 1701 banned Catholic monarchs and ensured a Protestant line of succession.

The King will not be the first modern monarch to have attended a Catholic funeral – Queen Elizabeth II went to the Catholic state funeral of King Baudouin of the Belgians, at St Michael’s Cathedral in Brussels, in August 1993.

Charles, when he was Prince of Wales, went to Pope John Paul II’s funeral, representing his mother the late Queen, in 2005, while his son William attended Pope Francis’s funeral mass earlier this year.

Aside from being the first Catholic funeral in three centuries, Katharine’s will be the first royal funeral at the Westminster Cathedral, in Victoria, central London, since its construction in 1903.

The Duchess of Kent was very close to Prince Harry’s mother, Princess Diana, and the pair often would often sit together at royal events and Wimbledon.

The two women enjoyed a warm friendship that dated back to her engagement to Harry’s father and she later spoke of her grief when Diana died in 1997.

It came as the Prince and Princess of Wales gave a loving tribute to the Duchess, with William and Kate saying she would be ‘much missed’.

The future king and queen described how she had ‘worked tirelessly’ in her life to help others.

Princess Diana and the Duchess of Kent had a warm friendship often sitting next to each other at royal events and WImbledon, pictured in 1987

With her unmistakable silvery blonde bob, the Duchess of Kent was, long before Princess Diana, was the royals' queen of compassion (Pictured: the Duchess in April 2011)
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With her unmistakable silvery blonde bob, the Duchess of Kent was, long before Princess Diana, was the royals’ queen of compassion (Pictured: the Duchess in April 2011)

Her decision, late in life, to give up the royal style HRH, which she had received on marrying the Duke in 1961, raised eyebrows (Pictured: the pair on their wedding day)
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Her decision, late in life, to give up the royal style HRH, which she had received on marrying the Duke in 1961, raised eyebrows (Pictured: the pair on their wedding day)

Friends say that, in time, the couple – who celebrated their 64th wedding anniversary in June – reached an amicable understanding (Pictured: the Duke and Duchess in 1991)
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Friends say that, in time, the couple – who celebrated their 64th wedding anniversary in June – reached an amicable understanding (Pictured: the Duke and Duchess in 1991)

The Duchess worked tirelessly to help others and supported many causes, including through her love of music. She will be a much missed member of the family’.

Prime Minister Sir Keir Starmer said the Duchess of Kent brought ‘compassion, dignity and a human touch to everything she did’, as he paid tribute following her death.

The King has approved that Royal Mourning should take place until and including the day of the Duchess’s funeral, which is expected to be on Tuesday.

During this time members of The Royal Family and staff will wear clothing which pays appropriate tribute during this period. Those in Livery, the Royal Mews and Troops on Public Duties will wear black armbands.

It is unlikely there will be any national mourning period as the Duchess had not been a working royal since 2002, although it is expected there will be those who wish to pay tribute.

Royal engagements are likely to continue, although households will consider the ‘format and tone’ of engagements during this period.