Sir Liam Ó Seachnasaigh (died 1579) was an Irish

Chief of the Name The Chief of the Name, or in older English usage Captain of his Nation, is the recognised head of a family or clan ( Irish and Scottish Gaelic: ''fine'') in Ireland and Scotland. Ireland There are instances where Norman lords of the time like ...

. Ó Seachnasaigh was the eldest legitimate son of Sir

Ruaidhrí Gilla Dubh Ó Seachnasaigh Sir Roger O'Shaughnessy ( Irish: ''Ruaidhrí Gilla Dubh Ó Seachnasaigh'') (died 1569) was an Irish Knight and Chief of the Name. The son of Sir Diarmaid Ó Seachnasaigh, Ruaidhrí was described by Sir Henry Sidney as "a very obedient and ci ...

by Lady Honora O'Brien, daughter of

Murrough O'Brien, 1st Earl of Thomond Murrough O'Brien, 1st Baron of Inchiquin, 1st Earl of Thomond () (died 7 November 1551) was an Irish peer, Chief of Clan O'Brien, and the last King of Thomond. Biography Murrough was a lineal descendant of Brian Boru, High King of Ireland, and ...

, but till 1573 had been usurped as Chief by his uncle, Diarmaid Riabach. Diarmaid was deposed but in 1579 ambushed Sir Liam at Ard Maoldubhain. The latter was killed, but had so severely wounded Diarmaid that he died shortly after of his wounds. Sir Liam was succeeded by his younger brother, Dermot.

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 (February 1782 – 13 November 1855), also known as Séamus Ó hArgadáin, was a librarian at Queen's College, Galway and an important historian. Hardiman is best remembered for his '' History of the Town and County of Galway'' (1 ...

, 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. It promotes historical preservation, as well as the study of the archaeology and history of the west of Ireland. As of January 2002, the Society had published 53 cons ...

, vi (1909–10), p. 64; vii (1911–12), p. 53. *

John O'Donovan John O'Donovan may refer to: *John O'Donovan (scholar) (1806–1861), Irish language scholar and place-name expert *John O'Donovan (politician) (1908–1982), Irish TD and Senator *John O'Donovan (police commissioner) (1858–1927), New Zealand pol ...

The Genealogies, Tribes, and Customs of Hy-Fiachrach
Dublin:

Irish Archaeological Society The Irish Archaeological Society (sometimes spelled as "Irish Archæological Society") was a learned society, founded in 1840. Among the founders were the scholar John O'Donovan and the Rev. Dr. Todd, who acted as secretary. The Irish Archaeol ...

. 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 Nobility from County Galway

Liam Liam is a short form of the Germanic name William, or its Irish variant Uilliam. Etymology The original name was a merging of two Old German elements: ''willa'' ("will" or "resolution"); and ''helma'' ("helmet"). The juxtaposition of these ...

16th-century Irish people 1579 deaths Year of birth unknown {{Ireland-bio-stub