Margaret O'Brien d.1636 (1565–1636) Parents Connor O'Brien, 3rd Earl of Thomond Una O'Brien Children James Butler Elinor Butler Theobald Butler Edward Butler Siblings Teige O'Brien Daniel O'Brien, 1st Viscount Clare Mary O'Brien Honora O'Brien Donogh O'Brien, 4th Earl of Thomond Lady Honor O'Brien Partners James Butler, 2nd/12th Baron Dunboyne