Mary (née O'Brien), Countess of Orkney (1755-1831), Countess in her own right; wife of 1st Marquess of Thomond
Sitter in 2 portraits
'Miss Nelly O'Brien' (Mary (née O'Brien), Countess of Orkney)
by Samuel William Reynolds, after Sir Joshua Reynolds
mezzotint, published 1836
NPG D3754
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
Orkney Islands
