Amelia Osborne, Marchioness of Carmarthen

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Amelia, Marchioness of Carmarthen
François-Hubert Drouais - Lady Amelia Darcy, 9th Baroness Conyers (1754-1784).jpg
Amelia Osborne, painted by François-Hubert Drouais
Lady Amelia Darcy

(1754-10-12)12 October 1754
Died27 January 1784(1784-01-27) (aged 29)
ChildrenGeorge Osborne, 6th Duke of Leeds
Mary Pelham, Countess of Chichester
Francis Osborne, 1st Baron Godolphin
Augusta Leigh
Parent(s)Robert Darcy, 4th Earl of Holderness
Mary Doublet

Amelia Osborne, Marchioness of Carmarthen, 12th Baroness Darcy de Knayth, 9th Baroness Conyers, 5th Countess of Mértola (née Darcy; 12 October 1754 – 27 January 1784), was a British peer and a Portuguese countess.


She was the only surviving child of Robert Darcy, 4th Earl of Holderness, and his wife, the former Mary Doublet. On 29 November 1773, she married Francis Osborne, Marquess of Carmarthen, in London,[1] and they had three children:

The marchioness's portrait was painted in about 1764 by François Hubert Drouais.[2]

On 16 May 1778, Amelia succeeded to the titles of 12th Baroness Darcy de Knayth and 9th Baroness Conyers in her own right, as the only surviving child of her father. Her right to the baronies of Darcy de Knayth and Conyers were eventually confirmed in 1798 (long after her death), and she also inherited the Portuguese countship of Mértola from him.

Lord and Lady Carmarthen divorced in May 1779. It was said that the marchioness had become over-friendly with John "Mad Jack" Byron (father of the poet, Lord Byron), who visited her at home in Grosvenor Square when her husband was absent, and that they had been having an affair.[3][4] Almost immediately after the divorce, she married Byron. They had one daughter, Augusta Leigh.

A year after the birth of her daughter by a year, in 1784, Amelia died[5] and the titles were inherited by her eldest son, George.


  1. ^ L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 174.
  2. ^ "Portrait of Lady Amelia Darcy". artnet. Retrieved 1 February 2018.
  3. ^ Lawbook Exchange Ltd (1779). Trials for Adultery, Or, The History of Divorces. The Lawbook Exchange, Ltd. pp. 10–. ISBN 978-1-58477-468-6.
  4. ^ George Gordon Byron Baron Byron (2015). Byron's Letters and Journals: A New Selection. Oxford University Press. ISBN 978-0-19-872255-7.
  5. ^ The International Monthly Magazine of Literature, Science, and Art. Stringer & Townsend. 1852. pp. 142–.
Portuguese nobility
Preceded by
Robert Darcy
Countess of Mértola
Succeeded by
George Osborne
Peerage of England
Preceded by
Robert Darcy
Baroness Darcy de Knayth
Succeeded by
George Osborne
Baroness Conyers