Lady Margaret O'Brien Peerage person ID=216912 (1530–1568) Parents Donough O'Brien, 2nd Earl of Thomond Lady Ellen Butler Children unknown son Bourke unknown daughter Bourke John na Seamar Burke, 1st Baron Leitrim unknown son Bourke Murrough McDermot O'Brien, 3rd Baron Inchiquin Siblings Mary O'Brien Teig O'Brien Connor O'Brien, 3rd Earl of Thomond Honora O'Brien Móre O'Brien Turlough O'Brien Partners Dermod O'Brien, 2nd Baron Inchiquin Richard Burke, 2nd Earl of Clanricarde