Mary Carnegie

Mary C. Endicott (Chamberlain, Carnegie) was born on 16 April 1864 in Salem, the daughter of William C. Endicott, Sr. and Ellen P. Endicott. She married British Member of Parliament Joseph Chamberlain, father of future British Cabinet Ministers Arthur Neville and Joseph Austen Chamberlain on 26 November 1888, and moved to England. As Chamberlain's wife, she accompanied him on numerous state visits and served as stepmother to his children. She was widowed in 1914 and in 1916 married William H. Carnegie, the Dean of Westminster. Widowed again in 1936, she remained in England until her death in July of 1957.

http://www.masshist.org/collection-guides/view/fa0021