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In page William Smith O'Brien:

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Born in Dromoland, Newmarket on Fergus, County Clare, he was the second son of Sir Edward O'Brien, 4th Baronet, of Dromoland Castle.[1] His mother was Charlotte Smith, whose father owned a property called Cahirmoyle in County Limerick. William took the additional surname Smith, his mother's maiden name, upon inheriting the property. He lived at Cahermoyle House, a mile from Ardagh, County Limerick.[2] He was a descendant of the eleventh century Ard Rí (High King of Ireland), Brian Boru.[3] He received an upper-class English education at Harrow School and Trinity College, Cambridge.[4] Subsequently, he studied law at King's Inns in Dublin and Lincoln's Inn in London.[1]