Sir Dermot Ó Seachnasaigh, Chief of the Name, died 1606. He was a son of Sir

Ruaidhrí Gilla Dubh Ó Seachnasaigh Ruaidhrí Gilla Dubh Ó Seachnasaigh (died 1569) was an Irish Knight and Chief of the Name. He is known in English as ''Sir Roger O'Shaughnessy''. The son of Sir Diarmaid Ó Seachnasaigh, Ruaidhrí was described by Sir Henry Sidney as "a ve ...

and Lady Honora O'Brien, daughter of

Murrough O'Brien, 1st Earl of Thomond Murrough O'Brien, 1st Earl of Thomond ( ga, Murchadh Carrach Ó Briain) (died 7 November 1551) was the last King of Thomond, and a descendant of the High King of Ireland, Brian Boru. Biography Murrough was a lineal descendant of Brian Boru, High ...

. Ó Seachnasaigh was in contention with his elder but illegitimate brother, John Ó Seachnasaigh, who till 1585 claimed lordship of Cenél Áeda. The two brothers travelled to

Dublin Dublin (; , or ) is the capital and largest city of Ireland. On a bay at the mouth of the River Liffey, it is in the province of Leinster, bordered on the south by the Dublin Mountains, a part of the Wicklow Mountains range. At the 2016 c ...

to attend the 1585 Parliament, after which no more is heard of John until 1601. Sir Dermot married Shyly Ni Hubert, and had issue Roger Gilla Dubh (born 1583), Dathi, William, Joan, Julia and Honora. * William had sons William, Edmond, Roger and Dermot. * Joan married Sir William Burke, and was the mother of

Richard Burke, 6th Earl of Clanricarde Richard Burke, 6th Earl of Clanricarde (; ; died August 1666) was an Irish peer. Career Richard was the eldest son of Sir William Burke and Joan O'Shaughnessy. He was a first cousin to the previous Earl and had served under him in the royali ...

. * Julia married Teige O'Kelly of Gallagh. * Honora married Johnock Burke of Tully.

References

* D'Alton, John
Illustrations, Historical and Genealogical, of King James's Irish Army List (1689)
Dublin: 1st edition (single volume), 1855. pp. 328–32. * ''History of Galway'',

James Hardiman James Hardiman (1782–1855), also known as Séamus Ó hArgadáin, was a librarian at Queen's College, Galway. Hardiman is best remembered for his '' History of the Town and County of Galway'' (1820) and '' Irish Minstrelsy'' (1831), one of the f ...

, 1820 * ''Tabular pedigrees of O'Shaughnessy of Gort'' (1543–1783), Martin J. Blake, Journal of the

Galway Archaeological and Historical Society The Galway Archaeological and Historical Society was founded on 21 March 1900, at the Railway Hotel, Galway. It promotes the study of the archaeology and history of the west of Ireland. Since 1900, the Society has published 70 volumes of the ''J ...

, vi (1909–10), p. 64; vii (1911–12), p. 53. * John O'Donovan
The Genealogies, Tribes, and Customs of Hy-Fiachrach
Dublin: Irish Archaeological Society. 1844. Pedigree of O'Shaughnessy: pp. 372–91. * ''Old Galway,'' Professor

Mary Donovan O'Sullivan Mary Josephine Donovan O'Sullivan was Professor of History at Queens College, Galway (now NUI Galway) from 1914 to 1957. Biography One of ten children, four of whom survived infancy, Donovan was born at Fair Hill Road in Galway on 24 November ...

, 1942 * ''Galway: Town and Gown,'' edited Moran et al., 1984 * ''Galway: History and Society'', 1996 {{DEFAULTSORT:O Seachnasaigh, Dermot People from County Galway Dermot 16th-century Irish people 17th-century Irish people