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Mary (née O'Brien), Countess of Orkney (1755-1831), Daughter of 1st Earl of Orkney; wife of 1st Marquess of Thomond

Sitter in 2 portraits

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D3754

'Miss Nelly O'Brien' (Mary (née O'Brien), Countess of Orkney)

by Samuel William Reynolds, after Sir Joshua Reynolds
mezzotint, published 1836
NPG D3754

D39377

Mary (née O'Brien), Countess of Orkney

by John Dixon, published by William Wynne Ryland, after Sir Joshua Reynolds
mezzotint, published 29 September 1774
NPG D39377