Mary O'Brien Peerage person ID=19325 (b. 1620) Parents Ellen FitzGerald Dermod O'Brien, 5th Baron Inchiquin Children Murrough Boyle, 1st Viscount Blesington Eleanor Boyle Elizabeth Boyle Honora Boyle Siblings Honora O'Brien Christopher O'Brien Henry O'Brien Murrough O'Brien, 1st Earl of Inchiquin Partners Michael Boyle