Margaret O'Neill (died 1655) (1580–1655) Parents Catherine O'Neill, Countess of Tyrone Hugh O'Neill, Earl of Tyrone Siobhan O'Donnell Children Joan Butler Edward Butler Ellice Butler Elizabeth Butler Edmund Butler, 4th Viscount Mountgarret Margaret Butler Richard Butler Ellen Butler Siblings Conn O'Neill Shane O'Neill Ellis MacDonnell, Countess of Antrim Henry O'Neill Sarah O'Neill Brian O'Neill Catherine O'Neil unknown daughter O'Neill Hugh O'Neill, 4th Baron of Dungannon Partners Richard Butler, 3rd Viscount Mountgarret