Murrough O'Brien, 1st Marquess of Thomond
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Sir Murrough O'Brien, 5th Baron O'Brien of Burren, 1st Baron Thomond of Taplow, 10th Baron & 5th Earl of Inchiquin, 1st Marquess of Thomond KP, PC (Ire), known from 1777 to 1800 as the 5th Earl of Inchiquin, was an Irish peer, soldier, politician, and Chief of Clan O'Brien.
Murrough O'Brien, 1st Marquess of Thomond KP, PC (1726–1808), 5th Earl of Inchiquin (1777–1800), wearing purple coat, white waistcoat, pale blue sash and breast star of the Order of Saint Patrick (Henry Bone)
Mary, Countess of Inchiquin (1750–1820), by Thomas Lawrence
O'Brien dynasty
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The O'Brien dynasty was an Irish Clan and noble house of Munster, founded in the 10th century by Brian Boru of the Dál gCais (Dalcassians). After becoming King of Munster, through conquest he established himself as Ard Rí na hÉireann. Brian's descendants thus carried the name Ó Briain, continuing to rule the Kingdom of Munster until the 12th century where their territory had shrunk to the Kingdom of Thomond which they would hold for just under five centuries.
Brian Boru, High King.
Image: Conor O'Brien Tomb Effigy Photo 2
Image: Toirdhealbhach Mor Ua Briain
Image: Murrough O'Brien, King of Thomond, Submits to King Henry VIII