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Henry O'Brien
Earl of Thomond
Detail (head) of a painted bust-length portrait of Henry O'Brien, 5th Earl of Thomond, showing a fair-haired man with a moustache against a dark background
Tenure 1624–1639
Predecessor Donogh, 4th Earl
Successor Barnabas, 6th Earl
Died 26 July 1639
Buried St Mary's Cathedral, Limerick
Spouse(s) Mary Brereton
Issue
Detail
Margaret, & others
Father Donogh, 4th Earl
Mother Elizabeth FitzGerald

Henry O'Brien, 5th Earl of Thomond PC (Ire) (1588–1639), styled Lord Ibrickane until 1624, was summoned to the House of Lords of the Irish Parliament of 1613–1615.

Birth and origins

Henry was born the eldest son of Donogh O'Brien and Elizabeth FitzGerald. His father was the 4th Earl of Thomond. His father's family were the O'Briens, an important Gaelic Irish dynasty, that descended from Brian Boru, medieval high king of Ireland.

Henry's mother was the fourth daughter of Gerald FitzGerald, 11th Earl of Kildare and his wife Mabel Brown.

Family tree
Henry O'Brien with wife, parents, and other selected relatives.
Conor
3rd Earl
c. 1535 – 1581
Una
O'Brien

d. 1589
Gerald
FitzGerald
11th Earl
Kildare

1525–1585
Helen
Roche

d. 1583
Donogh
4th Earl

d. 1624
Elizabeth
FitzGerald

d. 1617
Margaret
O'Brien
Henry
5th Earl
c. 1588 – 1639
Mary
Brereton

d. 1640
Barnabas
6th Earl

c. 1590 – 1657
Edward
2nd Marquess
Worcester

1602–1667
Margaret
O'Brien

d. 1681
Henry
7th Earl

1620–1691
Henry
Horatio

d. 1690
d.v.p.*
Henry
8th Earl

1688–1741
Legend
XXX Subject of
the article
XXX Earls of
Thomond
XXX Marquess
of Worcester
*d.v.p. = predeceased his father (decessit vita patris)
HenryO'Brien, 5th Earl of Thomond
Henry O'Brien, 5th Earl of Thomond

Marriage and children

On 13 July 1608 O'Brien married Mary Brereton, a rich heiress, the only daughter of William Brereton, 1st Baron Brereton and Margaret Savage.

Henry and Mary had five daughters:

  1. Mary (died 1686) married, on 24 June 1627, Charles Cokayne, 1st Viscount Cullen
  2. Margaret, who married first Edward Somerset, 2nd Marquess of Worcester and secondly Donough Kearney
  3. Elisabeth (1656–1659) married, on 21 August 1636, Dutton Gerard, 3rd Baron Gerard (1613–1640), grandson of Thomas Gerard, 1st Baron Gerard
  4. Anne (died 1645) married, in 1641, Henry O'Brien, 7th Earl of Thomond
  5. Honora married first Sir Francis Inglefield, knight of Wotton-Bassett, and secondly Sir Robert Howard, knight, son of the Earl of Berkshire

House of Lords

O'Brien was summoned on 3 March 1613 as Lord Ibrickane to the Irish House of Lords of the Irish Parliament of 1613–1615, the only parliament of King James I in Ireland.

5th Earl

Ibrickane succeeded his father on 5 September 1624 as the 5th Earl of Thomond.

Death

Thomond died in 1639 and was buried in St Mary's Cathedral, Limerick. He had no son and was succeeded in his titles by his brother Barnabas O'Brien, 6th Earl of Thomond.

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