Randal William MacDonnell, 1st Marquess of Antrim Irish peer, died 1791 (1749–1791) Parents Alexander MacDonnell, 5th Earl of Antrim Anne Plunkett Children Lady Letitia Mary MacDonnell Anne Katherine Mac Donnell, Countess of Antrim Charlotte MacDonnell, Countess of Antrim Siblings Lady Elizabeth Helena Mac Donnell Lady Rachel Mac Donnell Lady unknown Mac Donnell Partners Letitia Morres