Duchess of Argyll. Name variations: Mathilda Campbell; Mathilda Heller; Mathilda Mortimer. Born Mathilda Costner Mortimer in Geneva, Switzerland, on August 20, 1925; died in Paris, France, on June 6, 1997; daughter of Stanley Mortimer of Litchfield, Connecticut; married Clemens Heller (divorced 1961); married Ian Douglas Campbell (1903–1973), 11th duke of Argyll, on June 15, 1963 (died 1973).
Of American parentage but raised in France by her grandparents, Mathilda Mortimer wed the 11th duke of Argyll in 1963, following his notorious split with wife number three, Margaret (d. 1993). The couple gave lavish parties at Inveraray Castle, their home in the Scottish county of Argyllshire.