Mary O'Brien Butler Peerage person ID=411389 Parents Elizabeth Power Pierce O'Brien Butler Children Mary Sadleir Eliza Sadleir Siblings John O'Brien Butler Pierce O'Brien Butler Mary Anne O'Brien Butler Jane O'Brien Butler Catherine O'Brien Butler Murrough O'Brien Butler Margery O'Brien Butler William O'Brien Butler Frances O'Brien Butler Edmund O'Brien Butler Grace O'Brien Butler Partners Nicholas Sadleir