Lady Mary Trevelyan was the wife of Sir Charles Philips Trevelyan, 3rd Baronet (1870-1958) and was a political supporter of women's suffrage. After 1904 she became the president of the Northumberland Women's Liberal Federation (WLF). After her husband inherited Wallington Hall, Northumberland in 1928, the couple spent much of their time devoted to the estate and the village of Cambo.