by Susan Flantzer
© Unofficial Royalty 2024

Sophia Sidney, Baroness De L’Isle and Dudley was born Sophia FitzClarence on August 25, 1796, in London, England. She was the third of the ten children and the eldest of the five daughters of King William IV of the United Kingdom and his mistress Dorothea Jordan. Sophia’s paternal grandparents were King George III of the United Kingdom and Charlotte of Mecklenburg-Strelitz. Francis Bland, a stagehand, and his mistress Grace Phillips, an actress were her maternal grandparents.

From 1790 until 1811, before he became king, King William IV of the United Kingdom had a long-term relationship with actress Dorothea Jordan. Their relationship resulted in ten children who were given the surname FitzClarence. The surname comes from the Anglo-Norman Fitz, meaning “son of” and Clarence, from King William IV’s title before he became king, Duke of Clarence.

Dorothea Jordan was born Dorothea Bland was born in County Waterford, Ireland, the daughter of Francis Bland, a stagehand, and his mistress Grace Phillips, an actress. Her mother encouraged Dorothea to enter the theater, and within a few years, she began to draw large crowds for her performances. She left Ireland in 1782 and moved to Leeds, England. It was at this point that she took the name Jordan. She performed for three years with the York Company, before being lured away in 1785 to move to the Royal Theatre, Drury Lane in London. By then, Dorothea was becoming a very popular performer and could be counted on to bring large crowds every night. It was at Drury Lane that her life would come to the attention of The Duke of Clarence several years later.

Sophia’s parents The Duke of Clarence (later King William IV) and Dorothea Jordan; Credit – Wikipedia

In 1790, Dorothea was first noticed by The Duke of Clarence (later King William IV) while performing at Drury Lane. They quickly began an affair that would last for the next 21 years. Dorothea moved in with the Duke at his home, Clarence Lodge in Roehampton, London, England and later they moved to Bushy House in Bushy Park in Richmond upon Thames, London, England.

In 1797, King George III of the United Kingdom appointed his third son William, then Duke of Clarence, the ranger of Bushy Park. The position came with the residence Bushy House in Bushy Park. William and Dorothea lived there with their ten children until their relationship ended in 1811. William continued living there with his children and later with his wife Adelaide Saxe-Meinigen after they married in 1818.

The children of King William IV and Dorothea Jordan had an elder half-brother, William Henry Courtney, born around 1788 to an unknown mother, and named after his father whose given names were William Henry. Dorothea Jordan cared for William, and she was fond of him and he was fond of her. William served in the Royal Navy from 1803 until 1807 when his ship HMS Blenheim was lost in a gale off Madagascar. Despite an extensive search, no trace of the ship was ever found. 590 men were lost aboard HMS Blenheim, including King William IV’s eldest illegitimate son nineteen-year-old William Henry Courtney.

Nine of the ten children of King William IV and Dorothea Jordan were named after nine of William’s fourteen siblings. The tenth child was given William’s middle name Henry.

• George FitzClarence, 1st Earl of Munster (1794 – 1842), married Mary Wyndham, had seven children
• Henry Edward FitzClarence (1795 – 1817), unmarried, died at age 22
• Mary FitzClarence (1798 – 1864), married General Charles Richard Fox, no children
• Frederick FitzClarence (1799 – 1854), married Lady Augusta Boyle, had two children
• Elizabeth FitzClarence (1801 – 1856), married William Hay, 18th Earl of Erroll, had four children
• Adolphus FitzClarence (1802 – 1856), unmarried
• Augusta FitzClarence (1803 – 1865), married (1) The Honorable John Kennedy-Erskine, had three children; married (2) Admiral Lord Frederick Hallyburton, no children
• Augustus FitzClarence (1805 – 1854), Sarah Elizabeth Catharine Gordon, had six children
• Amelia FitzClarence (1807-1858), married Lucius Bentinck Cary, 10th Viscount Falkland, had one son

William and Dorothea’s children married into the British aristocracy and their many descendants include a number of notable people including sisters Princess Alexandra, Duchess of Fife and Princess Maud, Countess of Southesk (granddaughters of King Edward VII and daughters of Princess Louise, Princess Royal and Alexander Duff, 1st Duke of Fife, a descendant of Dorothea Jordan and King William IV), Duff Cooper, 1st Viscount Norwich (British diplomat, Cabinet member, author), John Crichton-Stuart, 7th Marquess of Bute (also known as Johnny Dumfries, racing driver), and David Cameron, Prime Minister of the United Kingdom.

By 1811, William was pressured by his family to find a suitable wife. At the time he was fourth in line for the throne following his elder brother The Prince of Wales, the future King George IV, George’s only child Princess Charlotte of Wales, and George’s next oldest brother who was childless Prince Frederick, Duke of York. William gave in to the pressure and ended his relationship with Dorothea but ensured she was well provided for. William became closer to the throne when his niece Princess Charlotte died in 1817 giving birth to a stillborn son. When King George IV died in 1830, William succeeded to the throne. Although William had ten children with Dorothea Jordan, his marriage with Adelaide of Saxe-Meiningen produced no surviving children. King William IV was succeeded by his niece Queen Victoria. Queen Victoria had relationships with her first cousins, King William IV’s illegitimate children. They are mentioned in Queen Victoria’s diaries when visiting Windsor Castle.

Sophia and her siblings had little contact with their mother Dorothea Jordan after 1811 when their father ended his relationship with her. After losing much of her savings when her daughter Augusta and her husband ran up large debts in her name, Dorothea’s health quickly began to decline. Virtually penniless, Dorothea Jordan died in Saint-Cloud, France on July 5, 1816, at the age of 54. She is buried in the local cemetery in Saint-Cloud.

On August 13, 1825, Sophia married Philip Charles Shelley Sidney, the only son of Sir John Shelley-Sidney, 1st Baronet, and Henrietta Hunloke, and the first cousin of poet Percy Bysshe Shelley. Sophia’s husband opted to drop “Shelley” from his surname.

Sophia and Philip had six children:

• Adelaide Augusta Wilhelmina Sidney (1826 – 1904), married her first cousin Frederick FitzClarence, son of George FitzClarence, 1st Earl of Munster (an illegitimate son of King William IV and Dorothea Jordan), no children
• Philip Sidney, 2nd Lord De L’Isle and Dudley (1828 – 1898), married (1) Mary Foulis, had five children (2) Emily Frances Ramsay, no children
• Robert Dudley Sidney (1829 – 1830), died in infancy
• Elizabeth Frederica Sidney (born and died 1831), died in infancy
• Ernestine Wellington Sidney (1834 – 1910), married Philip Perceval, had four children
• Sophia Philippa Sidney (1837 – 1907), married Alexander, Graf von Kielmannsegg, no children

Sophia’s husband Philip Sidney served in the House of Commons from 1829 – 1831, was an equerry to his father-in-law King William IV from 1830 – 1835, and served as Surveyor-General of the Duchy of Cornwall from 1833 – 1849. In 1835, Philip was created Baron De L’Isle and Dudley. When his father died In 1849, twelve years after Sophia’s death, Philip became 2nd Baronet of Penshurst Place. Philip Sidney, 1st Baron De L’Isle and Dudley died on March 4, 1851, aged 50, and was succeeded in his titles by his son Philip Sidney, 2nd Baron De L’Isle and Dudley.

In January 1837, Sophia was appointed by her father King William IV as State Housekeeper at Kensington Palace in London. Three months later, on April 10, 1837, 40-year-old Sophia died after delivering a premature stillborn baby at Kensington Palace. She had recently completed a charming watercolor painting of her father. Sophia’s death had a severe impact on her father King William IV, who died two months later on June 20, 1837.

Sophia was interred in the Sidney Chapel at St. John the Baptist Church in Penshurst, Kent, England near Penshurst Place, the home of the Sidney family for over 450 years. There is a memorial to Sophia at St. John the Baptist Church, a life-size figure of her on a pedestal with Grecian drapery, holding a Bible, with her eyes looking upward.

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Works Cited

• Beauclerk-Dewar, Peter & Powell, Roger. (2006). Right Royal Bastards – The Fruits of Passion. Burke’s Peerage & Gentry LLC.
• Flantzer, Susan. (2015). King William IV of the United Kingdom. Unofficial Royalty. https://www.unofficialroyalty.com/king-william-iv-of-the-united-kingdom/
• Mehl, Scott. (2020). Dorothea Jordan, Mistress of King William IV of the United Kingdom. Unofficial Royalty. https://www.unofficialroyalty.com/dorothea-jordan-mistress-of-king-william-iv-of-the-united-kingdom/
• Weir, Alison. (2008). Britain’s Royal Families – The Complete Genealogy. Vintage Books.
• Wikipedia. Sophia Sidney, Baroness De L’Isle and Dudley (2024). https://en.wikipedia.org/wiki/Sophia_Sidney,_Baroness_De_L%27Isle_and_Dudley