Amelia Osborne, Marchioness of Carmarthen


Amelia Osborne, Marchioness of Carmarthen, 12th Baroness Darcy de Knayth, 9th Baroness Conyers, 5th Countess of Mértola, was a British peer and a Portuguese countess.

Life

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, and they had three children:
The marchioness's portrait was painted in about 1764 by François-Hubert Drouais.
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, 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, who visited her at home in Grosvenor Square when her husband was absent, and that they had been having an affair. 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 and the titles were inherited by her eldest son, George.