Henry O'Brien, 7th Earl of Thomond PC (Ire)

Privy Council of Ireland

The Privy Council of Ireland was an institution of the Kingdom of Ireland until 31 December 1800 and of the United Kingdom of Great Britain and Ireland 1801-1922...

 (c.1620 – 2 May 1691) was an Irish peer, styled Lord Ibrackan from 1639 to 1657.

O'Brien was the son of Barnabas O'Brien, 6th Earl of Thomond

Barnabas O'Brien, 6th Earl of Thomond

Barnabas O'Brien, 6th Earl of Thomond , son of Donogh O'Brien, 4th Earl of Thomond; succeeded his brother, 1639; lord-lieutenant of Clare, 1640–1: his rents seized, 1644; admitted a parliamentary garrison to Bunratty Castle and went to England: joined Charles I; successfully petitioned parliament...

 and Anne Fermor.
In 1641, he married his first cousin Anne O'Brien (d. September 1645), daughter of Henry O'Brien, 5th Earl of Thomond

Henry O'Brien, 5th Earl of Thomond

Henry O'Brien, 5th Earl of Thomond was an Irish peer, styled Lord Ibrickane until 1624.O'Brien was the son of Donogh O'Brien, 4th Earl of Thomond and Elisabeth FitzGerald...

, by whom he had one son:

• Henry O'Brien, Lord Ibrackan (c.1643-1678)

After Anne's death, he married Sarah Russell, daughter of Sir Francis Russell, 2nd Baronet, by whom he had five children:

• Henry O'Brien, died in infancy
• Henry Horatio O'Brien, Lord Ibrackan (d. 1690), who was father of Henry O'Brien, 8th Earl of Thomond
  Henry O'Brien, 8th Earl of Thomond
  Henry O'Brien, Lord Ibrackan or Lord O'Brien , styled Hon. Henry O'Brien until 1657, was an Irish nobleman and politician. He was the son of Henry O'Brien, 7th Earl of Thomond and Anne O'Brien....
  
   (1688–1741)
• Lady Elizabeth O'Brien (d. 3 June 1688), without issue
• Lady Auberie Anne Penelope O'Brien, married Henry Howard, 6th Earl of Suffolk
  Henry Howard, 6th Earl of Suffolk
  Henry Howard, 6th Earl of Suffolk, 1st Earl of Bindon PC was an English nobleman, styled Lord Walden from 1691 to 1706....
  
   and had issue
• Lady Mary O'Brien, married Sir Matthew Dudley, 2nd Baronet