Lord
William
"4th Earl of Inchiquin, 9th Baron"
O'Brien
KB, PC
Born in Billy Kelly, Londonderry, Ireland
Ancestors 
Son of William O'Brien
and Mary Ephelia (Villiers) O'Brien
Brother of
Mary (O'Brien) FitzGerald, Henrietta O'Brien, James O'Brien, John O'Brien and William O'Brian
Husband of
Anne (Hamilton) O'Brien
— married
29 Mar 1720 [location unknown]
Descendants 
Father of
Mary O'Brien
Died
at about age 77
in Billy Kelley, Londonderry, Ireland
Profile last modified
| Created 23 Sep 2014
This page has been accessed 1,385 times.
Lord William O'Brien was a member of the aristocracy in British Isles.
This profile lacks source information. Please add sources that support the facts.
Biography
m. 1 Anne Hamilton, Countess of Orkney, (2) Mary Moore
Children:
- Mary O'Brien, Countess of Orkney c.1721, d. 10 May 1791
William was born in 1695. William O'Brien ... He passed away in 1757.[1]
Sources
- ↑ A source for this information is needed.
Wikipedia[1]
Is William your ancestor? Please don't go away!
Login to collaborate or comment, or
contact
the profile manager, or
ask our community of genealogists a question.
Login to collaborate or comment, or contact
the profile manager, or ask our community of genealogists a question.
Sponsored Search by Ancestry.com
DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA. Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA. Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
- Conor Myles John O'Brien
:
Family Tree DNA Y-DNA Test, haplogroup R-FGC13418, FTDNA kit #29355
Have you taken a DNA test? If so, login to add it. If not, see our friends at Ancestry DNA.
Comments: 3
Leave a message for others who see this profile.
There are no comments yet.
Login to post a comment.
Maria Maxwell
Mitchell Watson
Robert Kutz
Maria Maxwell
O'Brien-2485 and O'Brien-3383 appear to represent the same person because: Hi Mitchell, re your pre1700 project request. Please proceed with the merge of these duplicate profiles. See https://www.wikitree.com/wiki/Help:Merging for guidance on how to do this. Maria
posted
by Maria Maxwell
Mitchell Watson
Somehow this profile was changed to O'Brien # 2485 and this wife Esther Linton was arbitrarily dropped. O'Brien 3383 & 2485 are the same person and he was married to 2 separate wives (Esther Linton being one), and had more children than 2. Help please...
posted
by Mitchell Watson
Robert Kutz
O Brien-1374 and O'Brien-2485 appear to represent the same person because: Same father, same date of birth and name, same name of wife and name and date of birth of one child. Death date on O'Brien-1374 is incredible; other sources indicate date of death of either 2 MAR 1777 of ??/???1757.
posted
by Robert Kutz
Rejected matches › William (O'Brien) O'Brien Butler (abt.1695-abt.1773) › William O'Brien (1695-1793)
William is 22 degrees from Emeril Lagasse, 14 degrees from Nigella Lawson, 19 degrees from Maggie Beer, 36 degrees from Mary Hunnings, 28 degrees from Joop Braakhekke, 26 degrees from Michael Chow, 16 degrees from Ree Drummond, 22 degrees from Paul Hollywood, 21 degrees from Matty Matheson, 23 degrees from Martha Stewart, 30 degrees from Danny Trejo and 28 degrees from Molly Yeh on our single family tree. Login to find your connection.
O > O'Brien > William O'Brien KB, PC
Categories: Knights Companion of the Order of the Bath | Unsourced Profiles