Robert Power Trench, 4th Baron Ashtown (1897-1966) (1897–1966) Parents Violet Grace Cosby Frederick Trench, 3rd Baron Ashtown Children Siblings Frederic Sydney Trench Grace Mary Trench Dudley Oliver Trench, 5th Baron Ashtown Arthur Cosby Trench Partners Oonah Anne Green-Wilkinson Geraldine Ida Grey