Murtaugh O'Brien, High King of Ireland

1050 - 1119  (69 years)

• Name	Murtaugh O'Brien  [1, 2, 3, 4, 5]
  Suffix	High King of Ireland
  Birth	Abt. 1050  [2]
  Gender	Male
  Also Known As	Muirchertach Ua Briain  [1, 2, 3, 4]
  Title	1075-1086  [5]
  	King of Dublin
  Title	1086-1101  [2, 5]
  	King of Munster
  Title	1101-1114  [2, 3, 4, 5]
  	High King of Ireland
  Title	1115-1118  [5]
  	King of Munster (disputed)
  Title	1118-1119  [5]
  	High King of Ireland
  Death	Abt. 10 Mar 1119  [2]
  Person ID	I19	O'Brien Genealogy
  Last Modified	22 May 2026

  
  

  Father	Turlough O'Brien, High King of Ireland,   b. 1009   d. 14 Jul 1086, Kincora, Killaloe, Clare, Ireland (Age 77 years)
  Mother	Derbforgaill of Osraige   d. 1098
  Family ID	F11	Group Sheet  |  Family Chart

  
  

  Family	Derb Forgaill ingen Lethlobair
  Children	1. Mathgamain O'Brien   2. Domnall O'Brien, King of Dublin   d. 1135, Lismore, Waterford, Ireland   3. Bjaðmunjo O'Brien   4. Lafracoth O'Brien
  Family ID	F17	Group Sheet  |  Family Chart
  Last Modified	22 May 2026

  
  

• Sources

  [S3] Wikipedia Contributors, Wikipedia: The Free Encyclopedia, "Toirdelbach Ua Briain," https://en.wikipedia.org/wiki/Toirdelbach_Ua_Briain, (San Francisco, CA: Wikimedia Foundation, Inc.). [S4] Wikipedia Contributors, Wikipedia: The Free Encyclopedia, "Muirchertach Ua Briain," https://en.wikipedia.org/wiki/Muirchertach_Ua_Briain, (San Francisco, CA: Wikimedia Foundation, Inc.). [S5] Wikipedia Contributors, Wikipedia: The Free Encyclopedia, "Domnall Gerrlámhach," https://en.wikipedia.org/wiki/Domnall_Gerrlámhach, (San Francisco, CA: Wikimedia Foundation, Inc.). [S6] Wikipedia Contributors, Wikipedia: The Free Encyclopedia, "Bjaðmunjo Mýrjartaksdóttir," https://en.wikipedia.org/wiki/Bjaðmunjo_Mýrjartaksdóttir, (San Francisco, CA: Wikimedia Foundation, Inc.). [S14] Wikipedia Contributors, Wikipedia: The Free Encyclopedia, "O'Brien dynasty," https://en.wikipedia.org/wiki/O'Brien_dynasty, (San Francisco, CA: Wikimedia Foundation, Inc.).