Mary O'Brien Peerage person ID=147185 (b. 1620) Parents Donough O'Brien, 2nd Earl of Thomond Lady Ellen Butler Children Richard Bourke, 3rd Baron Bourke of Castleconnell Theobald Bourke, 1st Baron Bourke of Brittas John Bourke, 2nd Baron Bourke of Castleconnell William Bourke Thomas Bourke Siblings Teig O'Brien Connor O'Brien, 3rd Earl of Thomond Lady Margaret O'Brien Honora O'Brien Móre O'Brien Turlough O'Brien Partners Theobald Bourke