. . "O'Brien of Merrion Square and Boris-in-Ossory" . . . "Baronet" . . "O'Brien baronets" . . . . "O'Brien of Leaghmenagh" . . . . . . . . . . . "O'Brien of Merrion Square and Borris-in-Ossory" . . . "O'Brien baronets" . . . . . "O'Brien of Kilfenora" . . . . . "O'Brien of Ardtona" . . . . . . . "baronet of Merrion Square and Boris-in-Ossory" . . . . .