Daniel O'Brien, 1st Viscount Clare Irish politician (1577–1666) Parents Una O'Brien Connor O'Brien, 3rd Earl of Thomond Children Murrough O'Brien Margaret O'Brien Donough O'Brien Teige O'Brien Connor O'Brien, 2nd Viscount Clare Siblings Donogh O'Brien, 4th Earl of Thomond Mary O'Brien Teige O'Brien Margaret O'Brien Lady Honor O'Brien Honora O'Brien Partners Lady Catherine FitzGerald