The Duke and Duchess of Westminster have announced the birth of their first child. The Billionaire aristocrat 7th Duke and his wife Olivia, who married in June last year, have welcomed a baby girl named Lady Cosima Florence Grosvenor, born in London, 27 July, 2025.
“The Duke and Duchess of Westminster are thrilled to announce the birth of their baby daughter,” a spokesperson for the couple said. “Both the duchess and Cosima are doing well.
“The duke and duchess now look forward to spending this special time together as a family.”
The duke, one of the UK’s biggest landowners, is a close friend of both the Prince of Wales and the Duke of Sussex, and godfather to Prince George of Wales and also reportedly to Prince Archie of Sussex.
The Duke of Westminster married Olivia Henson at Chester Cathedral on 7 June, 2024. The Prince of Wales stood as one of the duke’s ushers.
Crowds lined the streets of Chester to cheer the arrival of the duke, his bride with her father, and the Prince of Wales. Princess Eugenie, Mrs Jack Brooksbank was one of the 400 guests.
The Duke's calculated wealth of just over £9.7 billion puts him 13th on the 2022 Sunday Times Rich List. He was until 2024 perhaps one of the country's most eligible bachelors.
The young duke is a fourth cousin once removed of the King. They both have Romanov blood, the duke via his mother Natalia, and the King via the late Prince Philip's Romanov descent.
The duke's parents, the 6th Duke and Natalia Phillips married at Chester Cathedral, 7 October, 1978, and the Royal Family were there to celebrate the union of one of Britain's wealthiest men and Natalia, daughter of one of Queen Elizabeth II's great friends, the former Georgina Wernher. The duke's aunt, Lady Leonora Grosvenor, married the late 5th Earl of Lichfield at the cathedral, 8 March, 1975, and another aunt, Lady Jane Grosvenor married the 10th Duke of Roxburghe there, 10 September, 1977.
The Duke and Olivia Henson became engaged at Eaton Hall in April 2023.
Hugh Westminster, 34, is godfather to Prince George of Wales, and a close confidante of the Prince and Princess of Wales. He was born 29 January, 1991, the only son of the 6th duke (1951-2016).
Hugh Richard Louis Grosvenor, the 7th duke, inherited the Eaton Hall estate near Chester, and large land holdings in London, Lancashire, Scotland, and in Canada, on the death of his late father, who died suddenly on his Abbeystead estate in Lancashire, 9 August 2016. The Westminster fortune is estimated to stand at 9.7 billion.
The duke’s mother, the former Natalia Ayesha Phillips (born 8 May 1959), descended from the Russia tsars and from Pushkin, is a granddaughter of Lady Zia Wernher, of Luton Hoo, a great friend of the late Queen Elizabeth II. It was at Luton Hoo where the late Queen and her consort spent many wedding anniversaries in the lifetime of Lady Zia, who died in 1977, and her husband Harold, who died in 1973.
The Duke was present at the Coronation of the King and Queen in May 2023, and he carried a standard in the procession into Westminster Abbey.
The duke has three sisters, Lady Tamara van Cutsem (born 20 Dec 1979), wife of another of the King’s godsons, Edward van Cutsem, and Lady Edwina Snow (born 4 Nov, 1981), a criminologist, wife of historian and broadcaster Dan Snow, and Lady Viola Roberts (born 9 Oct, 1992), wife of Dragoon Guards officer, Angus Roberts.
Their is no heir to the dukedom, and a son and heir would have secured the peerage and the vast Grosvenor inheritance. The peerage can only be inherited by male heirs. The current heir presumptive to the Marquessate of Westminster, but not the dukedom, is a Grosvenor cousin, Francis Grosvenor, 8th Earl of Wilton (born 8 Feb, 1934).
A future son will be heir apparent to the titles Duke of Westminster (United Kingdom, let. pat. 27 Feb 1874), Marquess of Westminster (United Kingdom, let. pat. 13 Sep 1831), Earl Grosvenor (Great Britain, let. pat. 5 Jul 1784), Viscount Belgrave (Great Britain, let. pat. 5 Jul 1784), Baron Grosvenor, of Eaton in the County of Chester (Great Britain, let. pat. 8 Apr 1761), and a Baronet, styled "of Eaton" (England, let. pat. 23 Feb 1621/22).
Some ducal statistics: The 1st Duke, and most prolific of the Westminsters, was the father of seven sons and five daughters; the 2nd Duke (Bendor), four times wed, died leaving two daughters. A son died in childhood; the 3rd and fourth dukes were childless; the 5th Duke fathered one son and two daughters; the 6th Duke, who died in 2016, left a son, the current peer, and three daughters.
The dukedom of Westminster was the last dukedom to be given outside the confines of the royal family, and was created by Queen Victoria in 1874.
The Duchess of Westminster (born 1 Sept, 1992), is a senior account manager with Belazu, an ethical food company, in London. She is extremely well connected, with lines of descent from the Hoare banking dynasty, the Marquesses of Britsol, of Ickworth, Suffolk, and the Dukes of Rutland, of Belvoir Castle. She is the elder daughter of Mr Rupert Cornelius Brooke Henson (born 7 September, 1962), of Longworth, Oxfordshire, and his wife the former Caroline Belinda Frisby (born 17 August, 1963), scion of that landed gentry family, descended from the Hoare banking family and the Marquesses of Bristol. Olivia’s uncle, Charles Wolrige Gordon, is the Grand Master of Scottish freemasons, Scotland’s senior freemason. Olivia’s mother is the twin sister of Charles’s wife, Angela Clare Wolrige Gordon.
Olivia has a brother Jasper (born 1994), who announced his engagement last year to the Spanish aristocrat Isabel Rodriguez-Legorburu Cabrera Kabana, and a sister, Emilia (born 1997).
Olivia is a granddaughter paternally of Thomas John Brooke Henson, MC (1931-2024), and his first wife the former Jennifer Caswell Cornelius (born 1938), daughter of Leonard Raymond Cornelius (1907-88), and his wife the former Betty Kathleen Caswell (1916-2010). Her grandparents divorced and in 1983 Mrs Jennifer Henson married Robert Christopher Thoroton Hildyard (1912-86), scion of a Yorkshire landed gentry family, descended from the Foljambe Earls of Liverpool.
The Romanov link:-
Nicholas I, Tsar of Russia (1796-1855) > Grand Duke Michael of Russia (1832-1909) > Grand Duke Michael of Russia (1861-1929) > Lady Zia Wernher (1892-1977) > Georgina Wernher (1919-2011) > Natalia Ayesha Phillips (b 1959) > The 7th Duke of Westminster (b 1991)> Lady Cosima Grosvenor (b 2025)
Nicholas I, Tsar of Russia (1796-1855) > Grand Duke Constantine of Russia (1827-1892) > Grand Duchess Olga of Russia (1851-1926) > Prince Andrew of Greece (1882-1944) > Prince Philip, Duke of Edinburgh (1921-2021) > King Charles III (b 1948) > Prince William (b 1982)
Lady Cosima is also descended from the Dukes of Rutland :-
The 5th Duke of Rutland > Lady Katherine Manners > Lord Augustus Henry Charles Hervey > Lady Geraldine Mariana Hervey > Angela Beryl Hoare > Simon Rollo Frisby > Caroline Belinda Frisby > Olivia Grace Henson > Lady Cosima Grosvenor
The infant's descent from the Marquesses of Bristol-
Frederick, 2nd Marquess of Bristol > Lord Augustus Henry Charles Hervey >Lady Geraldine Hervey > Angela Beryl Hoare > Simon Frisby . Caroline Frisby > Olivia Grace Henson > Lady Cosima
The Duke and Olivia are both 6x great grandchildren of the 5th Earl of Carlisle (making them 7th cousins) and 7x great grandchildren of the 4th Duke of Beaufort (making them 8th cousins).
Olivia is a great-great granddaughter of Henry Hoare (1866-1956), partner in the eponymous family concern - Hoare's Bank, of Ellisfield Manor, Basingstoke, White Wings, Angmering, Sussex, and La Lucretola, Lago di Como, Italy. The Old Etonian died 29 July, 1956.
The infant's descent from the Arbuthnot baronets:--
Sir William Arbuthnot, 1st Baronet (1766-1829) > John Alves Arbuthnot (1802-75) > William Arbuthnot (1833-96) > Alice Arbuthnot (b 1869) > Capt William Herbert Fox (1901-40) > Sara Fox (d 2018) > Caroline Frisby (b 1963) > Olivia Henson (b 1992) > Lady Cosima Grosvenor (b 2025)
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