Mary O'Brien, 3rd Countess of Orkney (c. 1721 – 1790) was the eldest daughter of Anne O'Brien, 2nd Countess of Orkney, and

William O'Brien, 4th Earl of Inchiquin {{Infobox officeholder , honorific-prefix = The Right Honourable , name = The Earl of Inchiquin , honorific-suffix = KB PC(I) , image = William_O’Brien,_4th_Earl_of_Inchiquin.jpg , caption = , alt ...

, and Countess of Orkney in her own right. She was

deaf Deafness has varying definitions in cultural and medical contexts. In medical contexts, the meaning of deafness is hearing loss that precludes a person from understanding spoken language, an audiological condition. In this context it is written ...

and was married by signs, in 1753, to her first cousin, Murrough O'Brien, fifth

Earl of Inchiquin Earl () is a rank of the nobility in the United Kingdom. The title originates in the Old English word ''eorl'', meaning "a man of noble birth or rank". The word is cognate with the Scandinavian form ''jarl'', and meant "chieftain", particular ...

, first Marquess of Thomond, and first Baron Thomond, of

Taplow Taplow is a village and civil parish in the Unitary Authority of Buckinghamshire, England. It sits on the left bank of the River Thames, facing Maidenhead in the neighbouring county of Berkshire, with Cippenham and Burnham to the east. It is the ...

, in

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

, K.P. She lived with her husband at his seat,

Rostellan Rostellan () is a civil parish, townland and village in the historical Barony of Imokilly, County Cork, Ireland. An electoral division of the same name forms part of the Cork East Dáil constituency. For census purposes, the village of Rostell ...

, near

Cork Harbour Cork Harbour () is a natural harbour and river estuary at the mouth of the River Lee in County Cork, Ireland. It is one of several which lay claim to the title of "second largest natural harbour in the world by navigational area" (after Port Ja ...

. She succeeded to the Earldom on 6 December 1756,Cokayne, G. E.; H. A. Doubleday & Lord Howard de Walden, eds. (1940). The Complete Peerage, or a history of the House of Lords and all its members from the earliest times, volume XIII: Peers created 1901 to 1938. 13 (2nd ed.). London: The St. Catherine Press. Volume X, p. 109. when her mother died without male issue. By his Lordship, she had an only surviving daughter,

Mary Mary may refer to: People * Mary (name), a feminine given name (includes a list of people with the name) Religious contexts * New Testament people named Mary, overview article linking to many of those below * Mary, mother of Jesus, also calle ...

, the fourth Countess. The Marquess of Thomond died in consequence of his horse falling with him in Grosvenor Square, on 10 February 1808, in his 85th year. The Countess of Orkney died on 10 May 1790.

References

1721 births 1791 deaths People associated with Orkney Orkney Earls of Orkney Orkney

Inchiquin Inchiquin ( ga, Inse Uí Chuinn) is a barony in County Clare, Ireland.Placenames Database of ...

Daughters of Irish earls Deaf royalty and nobility People from County Clare People from County Cork 18th-century Irish people Mary, Countess of Orkney Irish deaf people 18th-century Scottish people 18th-century Scottish women 18th-century Irish women {{Orkney-bio-stub