Eliza Courtney

Eliza Courtney (20 February 1792 – 2 May 1859) was the illegitimate daughter of the Whig politician and future Prime Minister Charles Grey, 2nd Earl Grey, and socialite Georgiana, Duchess of Devonshire, while Georgiana was married to William Cavendish, 5th Duke of Devonshire.
The Duchess was forced by her husband to relinquish Eliza shortly after her birth, to be raised by Charles Grey's parents, Charles Grey, 1st Earl Grey, and Elizabeth Grey, Countess Grey. The Duchess came to visit Eliza in secret. Eliza named her firstborn daughter Georgiana.
The name Courtney, extinct since the death of Charles Kelland Courtney in 1761, was derived from her great-uncle, her maternal grandmother's brother, William Poyntz (d. 1809), having married Isabella (d. 1805), sister and co-heiress of the aforementioned Charles Courtney, the last of the west country family of "Courtney of Trethurfe" and "Courtney of Tremeer".
Upbringing.
Eliza Courtney was born in France, in Aix-en-Provence on 20 February 1792. She was brought to Falloden, Northumberland in northern England and adopted by her paternal grandparents. Unlike her mother's legitimate children from her marriage, Eliza was not raised as part of the Devonshire House set in London. Her mother, Georgiana, could not acknowledge her daughter and visited her in secret until her own death. Several anguish-ridden poems from mother to daughter survive; two are reproduced below:
<poem>
And yet remote from public view flower there is of timid hue,
Beneath a sacred shade it grows,
But sweet in native fragrance blows.
From storms secure, from tempests free,
But ah! too seldom seen by me.
For scarce permitted to behold
With longing eyes each grace unfold.
My bosom struggles with its pain
And checks the wishes form'd in vain;
Yet when I perchance supremely blest,
I hold the floweret to my breast,
Enraptur'd watch its purple glow
And blessings (all I have) bestow.
The gentle fragrance soothes my care
And fervent is my humble prayer
That no dread evil may beset
My sweet but hidden violet.
</poem>
<poem>
Unhappy child of indiscretion,
poor slumberer on a breast forlorn
pledge of reproof of past transgression
Dear tho' unfortunate to be born
For thee a suppliant wish addressing
To Heaven thy mother fain would dare
But conscious blushes stain the blessing
And sighs suppress my broken prayer
But in spite of these my mind unshaken
In present duty turns to thee
Tho' long repented ne'er forgotten
Thy days shall lov'd and guarded be
And should th'ungenerous world upbraid thee
for mine and for thy father's ill
A nameless mother oft shall assist thee
A hand unseen protect thee still
And tho' to rank and wealth a stranger
Thy life a humble course must run
Soon shalt thou learn to fly the danger
Which I too late have learnt to shun
Meanwhile in these sequested vallies
Here may'st thou live in safe content
For innocence may smile at malice
And thou-Oh ! Thou art innocent
</poem>
Georgiana was allowed to see her daughter occasionally when the Greys brought Eliza to London, and acted as a sort of unofficial godmother.
In 1808, her maternal aunt Henrietta Ponsonby, Countess of Bessborough, who didn't know she was Eliza's aunt, visited the Greys and was dismayed at what she observed:
Eliza was not informed of her true parentage until after the death of her mother in 1806.
Husband.
In 1809 her "quasi-sister" (but actual aunt) Lady Hannah Althea Grey, widow of George Edmund Byron Bettesworth, married the Member of Parliament and trader the Rt. Hon. Edward "Bear" Ellice (1783–1863). Five years later, on 10 December 1814 in Scarborough, North Yorkshire, Eliza married Lt. Col. Robert Charles Ellice, a younger brother of her "brother-in-law" Edward Ellice. Their father was the Scots-born Alexander Ellice (1743–1805) of Bath, London and Montreal, a partner in the Schenectady, New York firm of Phyn, Ellice & Co.
In March 1814, Lord Broughton recorded meeting Eliza at dinner and described her as:
Robert Ellice had a distinguished military career, rising from the military rank of "ensign" to General. 
At some point he served in South America and was present at the capture of Buenos Aires.
Ellice was acting Governor-General of Malta for five-and-a-half months, from 13 May to 27 October 1851.
In the 1856 Webster's, he is listed as having a residence at 57 Park Street, Mayfair. He died 18 June 1856.
Children.
Eliza Courtney, Mrs Ellice, had three daughters and two sons.
Georgiana.
Her daughter Georgiana was born on 12 October 1817. On 4 November 1846, Georgiana Ellice married Hugh Horatio Seymour (1821–1892). Seymour was the son of Lt. Col. Hugh Henry Seymour (1790–1821), himself son of Admiral Lord Hugh Seymour (1759–1801), who was the fifth son of the first Marquess of Hertford by his marriage to Charlotte Cholmondeley, daughter of the first Marquess of Cholmondeley. 
His grandson was Sir Horace James Seymour GCMG CVO (1885–1978), a diplomat who was British Minister in Tehran from 1936 to 1939 and British Ambassador to China, 1942 to 1946. One of Sir Horace's grandsons, James Seymour (born 1956) is married to Anya Hindmarch.
Eliza.
Eliza had another daughter, also named Eliza, the following year, in 1818. This Eliza married Henry Bouverie William Brand (1814–1892) in 1838. After a distinguished speakership of the House of Commons, Eliza's husband was created Viscount Hampden; later still he inherited from his brother the Barony of Dacre, as 23rd in line. Descendants include the present Lord Monk Bretton; Sarah, Duchess of York and her daughters Princess Beatrice of York and Princess Eugenie; and Viscount Hampden. Eliza Ellice Brand died on 8 March 1899 at Pelham House, Lewes.
Alexandra.
Alexandra married the Rev. H. Harvey.
Robert.
Eliza's first son, Robert, was born on 1 January 1816. In March 1853, he married Eglantine Charlotte Louisa Balfour (died 18 April 1907), third daughter of Lt-General Robert Balfour of Balbirnie. Robert Ellice died on 19 December 1858.
In 1880 his son, Major Edward Charles Ellice, DSO (1917/8), J.P., M.P. (1903-6, Liberal, St. Andrews Boroughs), (1858–1934) succeeded his first cousin once removed, Edward Ellice II, to the Ellice estate at Invergarry, Inverness-shire.
In April 1889 Major Edward Charles Ellice married another first cousin once removed, Margaret Georgiana Freeman Thomas (died 1929), daughter of Frederick Freeman Thomas by his wife Mabel Brand, daughter of the 1st Viscount Hampden. Like him Margaret Georgiana was a descendant of Eliza Courtney, through Eliza's second daughter Eliza. Her brother was Freeman Freeman-Thomas, Viceroy of India and was created 1st Marquess of Willingdon.
Their fifth son, Russell (1902–1989) succeeded his father, his four elder brothers having perished young: three of them in the 1914-1918 war. [One was in the Cameron Highlanders (killed in action), one was in the Grenadiers (killed in action) and the third was lost on HMS Bulwark.]
Charles.
Eliza's second son, Charles Henry, was born in 1823 in Florence. Charles followed his father into the 24th Regiment of Foot and was sometime Quartermaster-General and then Adjutant-General to the Forces. He married Louisa Caroline Lambton, a daughter of William Henry Lambton and niece of the 1st Earl of Durham. Thom's "Upper Ten Thousand" for 1876 lists him as of Horningsheath, Bury St Edmunds. He was subject of Vanity Fair treatment, 20 October 1877. Lt. Gen. Sir Charles Henry Ellice, KCB died in 1888.
Death.
Eliza died a widow in Norwood, Surrey, on 2 May, 1859, at the age of 67. "Norwood in Surrey" in this case is Upper Norwood; South Norwood; West Norwood; or Sydenham.
Eliza Courtney's descendants include Sarah, Duchess of York and her daughters Princesses Beatrice and Eugenie of York, who are ninth and tenth in line to the British throne, respectively.