Ellen Murphy1 
From 1827, her married name became O’Brien.1
Children of Ellen Murphy and John O’Brien
- John O’Brien1 d. 1889
- William O’Brien1
- Terence O’Brien1
- Margaret O’Brien1
- Ellen O’Brien1
- Catto O’Brien1
- Anne O’Brien1
- James O’Brien1 b. 9 Jan 1832
- Jerome O’Brien1 b. 1835, d. 1892
- Peter O’Brien, 1st and last Baron O’Brien+1 b. 29 Jun 1842, d. 7 Sep 1914
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Jeremiah Murphy1
Child of Jeremiah Murphy
- Ellen Murphy+1 d. 19 Dec 1866
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
James O’Brien1 
He held the office of High Sheriff of County Clare in 1858.1 He lived at Ballynalacken Castle, County Clare, IrelandG.1
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Georgina Martyn1
From before 1865, her married name became Calcutt.1 From 1865, her married name became O’Brien.1
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
G. Martyn1
Child of G. Martyn
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Francis Macnamara Calcutt1 
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Jerome O’Brien1 
He gained the rank of Captain in the 28th Regiment.3
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
- [S142] Bernard, Sir Burke, editor, Burke’s genealogical and heraldic history of the landed gentry of Ireland, 3rd ed. (London, U.K.: Burkes Peerage Ltd, 1912), page 519. Hereinafter cited as Landed Gentry of Ireland.
- [S47] BIFR1976 page 241. See link for full details for this source. Hereinafter cited as. [S47]
Elizabeth Clarke1
From 1867, her married name became O’Brien.
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
- [S47] BIFR1976 See link for full details for this source. Hereinafter cited as. [S47]
- [S47] BIFR1976. [S47]
Edward Maunsell1
He lived at Deer Park, Sixmilebridge, County Clare, IrelandG.1
Children of Edward Maunsell and Wilhelmina Cannon
John O’Brien1 
He was a Cistercian monk.1
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
