O’Brien Dynasty

Early generations:

• Lorcán (Ancestor) (934 – 942)

High Kings of Ireland:

• Donnchad mac Cennétig (High King of Ireland, 978-1002)
• Brian Bórumha Ua Briain (High King of Ireland, 1002-1014) Had multiple children

Descendants of Brian Bórumha:

• Donnchad mac Briain (King of Munster, d. 1023)
• (Descendants continue through Kings, Earls, Barons of Thomond and Inchiquin)
• Tadhg mac Briain (King of Dublin, 1064-1070) Descendants continue below

Barons Inchiquin:

• Murchad mac Donnchada (King of Munster, 1068-1072)
• Toirdhealbhach mac Briain (King of Munster, 1072-1086)
• Diarmaid Ua Briain (King of the Isles, 1111-1112) Several disputed claimants
  (Descendants through various Kings of Munster)
• Conchubhar na Cathrach (King of Munster, 1138-1142)
• Toirdhealbhach mac Diarmaida Ua Briain (King of Munster, 1142-1165) (Descendants)
• Donnchadh Cairbreach Ua Briain (King of Thomond, 1194-1242)
  • Clann Briain (descendants include Brian Ruadh)
  • Clann Tadhg (descendants include Tadhg Cael Uisce)
• Toirdhealbhach Ó Briain (King of Thomond, 1276-1306) Descendants continue through Earls and Barons
• Donnchadh mac Toirdhealbhaig (King of Thomond, 1306-1311) Descendants
• Diarmaid mac Toirdhealbhaig (King of Thomond, 1311-1313)
• Donnchadh mac Diarmaida (King of Thomond, 1313-1317)
• Muircheartach Ó Briain (King of Thomond, 1317-1343)
• Brian Bán Ó Briain (King of Thomond, 1343-1350)
  (Descendants through Thomond lineage)
• Murchadh Carrach Ó Briain (1st Earl of Thomond & 1st Baron Inchiquin) (1543–1551) Descendants become Earls and Barons
• Donough O’Brien (2nd Earl of Thomond) Descendants continue through Earls
• (Dermot O’Brien becomes 2nd Baron Inchiquin)
• Connor O’Brien (3rd Earl of Thomond) (1553-1581) Descendants continue through Earls
• (Murrough O’Brien becomes 3rd Baron Inchiquin)
  (Descendants through Earls and Barons of Thomond and Inchiquin)
• William O’Brien (2nd Marquess of Thomond & 6th Earl of Inchiquin) (1808-1846) Descendants continue through Marquesses
• (Lucius O’Brien becomes 5th Baronet of Leameneh (later 13th Baron Inchiquin))
• James O’Brien (3rd Marquess of Thomond & 7th Earl of Inchiquin) (1846-1855) Descendants continue through Marquesses
• (Edward Donogh O’Brien becomes 14th Baron Inchiquin)
  (Lineage continues through Barons Inchiquin)
• Lucius William O’Brien (15th Baron Inchiquin) (1900-1929) Descendants
• Donough Edward Foster O’Brien (16th Baron Inchiquin) (1929-1968) Descendants
• Phaedrig Lucius Ambrose O’Brien (17th Baron Inchiquin) (1968-1982) Descendants
  
• Conor Myles John O’Brien (18th Baron Inchiquin) (1982-2023)
• Married Helen O’Farrell (1988)
• Daughters: Slaney and Lucia
• Grandsons: Conn and Jack
  
• Conor John Anthony O’Brien (19th Baron Inchiquin) (2023-present)
• Parents:
  • Father: Murrough Richard O’Brien (1910-2000)
  • Mother: Joan O’Brien (née Jenkinson) (1916-2004)
• Sister: Melissa Raposo Graham (3 May 1956 – Present)
• Wife: Vivian Sarah O’Brien (née Rouse) (Married 1982, Dissolved 2000)
• Children:
  • The Hon Fionn Murrough O’Brien (Heir to Titles) (28 November 1987 – Present )
  • The Hon Slaney Victoria O’Brien (24 October 1989 – Present )
    • Twin Daughters:
      • Lucia Lilly O’Brien (31 October 2022 – Present )
      • Saoirse Savanna O’Brien (31 October 2022 – Present )