Lady Catherine MacDonnell daughter of Randal MacDonnell, 1st Earl of Antrim Parents Ellis MacDonnell, Countess of Antrim Randal MacDonnell, 1st Earl of Antrim Children Randal Plunkett, 10th Lord Dunsany Thomas Plunkett Christopher Plunkett, 9th Lord Dunsany Siblings Alexander MacDonnell, 3rd Earl of Antrim Randal MacDonnell, 1st Marquess of Antrim Lady Sarah MacDonnell Lady Rose MacDonnell Lady Alice MacDonnell Lady Mary MacDonnell Lady Anne MacDonnell Partners Edward Plunkett