Martha de Havilland was a British writer barely known as such outside her inner family circle. She published her first book as "M. de Havilland," and the second as "Mrs. Charles de Havilland"-signing the latter’s preface by her initials, M. de H. She was born "Martha Saumarez," in Guernsey, Channel Islands, on September 5, 1797. She was the daughter of Richard Saumarez and Martha Le Mesurier, and the niece of Admiral James Saumarez, the 1st Baron de Saumarez. She married Major Charles de Havilland, son of Sir Peter de Havilland and Carterette Fiott, on October 7, 1819. She died on December 26, 1864 at age 67. From October 7, 1819, her married name became "de Havilland." She was the great-grandmother of British aviation pioneer and aircraft engineer Sir Geoffrey de Havilland, and of Oscar-winning actresses Olivia de Havilland and Joan Fontaine.