Mary O'Neill (died 1590) (1515–1590) Parents Conn O'Neill, 1st Earl of Tyrone unknown daughter O'Byrne Children Alexander Mac Donnell Sir James Mac Sorley Mac Donnell Randal MacDonnell, 1st Earl of Antrim Ann Mac Donnell Engas Mac Donnell unknown daughter Mac Donnell Siblings Phelim Caoch Ó Neill Conn O'Neill Shane O'Neill Henry 'Og' O'Neill Matthew O'Neill, 1st Baron Dungannon Partners Sorley Boy MacDonnell