Marmaduke William Constable-Maxwell (1760-1819) (1760–1819) Parents William Constable Lady Winifred Maxwell Children Peter Constable Constable-Maxwell William Constable-Maxwell, 10th Lord Herries Joseph Constable-Maxwell Henry Constable-Maxwell-Stuart, 16th of Traquair Theresa Constable-Maxwell Mary Constable-Maxwell Marmaduke Constable-Maxwell of Terregles Siblings Charles Stanley Mary Constable Anne Constable William Midleton Partners Theresa Apollonia Wakeman