Statistics for occurrence #1 of “Mary Todd” in chapter 10 of William H. Herndon, Jesse William Weik, Herndon's Lincoln: The True Story of a Great Life, Etiam in minimis major, The History and Personal Recollections of Abraham Lincoln by William H. Herndon, for twenty years his friend and Jesse William Weik:

...ho could even go back in the genealogical chart to the sixth century, Lincoln, the child of Nancy Hanks, whose descent was dimmed by the shadow of tradition, was finally united in marriage. When Mary Todd came to her sister's house in Springfield in 1839, she was in her twenty-first year. She was a young woman of strong, passionate nature and quick temper, and had left her home in Kentucky to avoid ...
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Mary Todd 89 60 3 0 0 user votes

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