Mary Martha Berthune, Lady Abbott (October 17, 1823 – February 25, 1898) was the wife of Sir John Abbott, the third Prime Minister of Canada. Family Bethune was the daughter of Anglican clergyman and McGill acting president John Bethune. She and John Abbott married on July 26, 1849 and had four sons and four daughters. Mary and John Abbott are maternal great-grandparents of actor Christopher Plummer. See also Spouse of the prime minister of Canada References 1823 births 1898 deaths Spouses of prime ministers of Canada