Mary Ann (née Todd) Lincoln (December 13, 1818 – July 16, 1882) was the wife of the 16th President of the United States, Abraham Lincoln, and was First Lady of the United States from 1861 to 1865.

A member of a large, wealthy Kentucky family, Mary was well educated. After living in the Todd House and a finishing school during her teens, she then moved to Springfield, Illinois and lived with her sister, Elizabeth. Mary was courted by Stephen Douglas, against whom her later husband notably debated. She and Abraham had four sons, only one of whom outlived her. Their home of about 15 years still stands in Springfield.

Lincoln suffered from headaches and other illness through much of her adult life. She supported her husband throughout his presidency, and was witness to his assassination.

Born in Lexington, Kentucky, the daughter of Robert Smith Todd, a banker, and Elizabeth Parker Todd, Mary was raised in comfort and refinement. When Mary was six, her mother died; her father married Elizabeth "Betsy" Humphreys Todd in 1826. Mary had a difficult relationship with her stepmother. From 1832, Mary lived in what is now known as the Mary Todd Lincoln House, an elegant 14-room residence in Lexington. From her father's two marriages, Mary had a total of 14 siblings.

Abraham Lincoln ⁱ/ˈeɪbrəhæm ˈlɪŋkən/ (February 12, 1809 – April 15, 1865) was the 16th President of the United States, serving from March 1861 until his assassination in April 1865. He successfully led his country through its greatest constitutional, military and moral crisis – the American Civil War – preserving the Union while ending slavery, and promoting economic and financial modernization. Reared in a poor family on the western frontier, Lincoln was mostly self-educated. He became a country lawyer, a Whig Party leader, Illinois state legislator in the 1830s, and a one-term member of the United States House of Representatives in the 1840s. After a series of debates in 1858 that gave national visibility to his opposition to the expansion of slavery, Lincoln lost a Senate race to his arch-rival Stephen A. Douglas. Lincoln, a moderate from a swing state, secured the Republican Party nomination. With almost no support in the South he swept the North and was elected president in 1860. His election was the signal for seven southern slave states to declare their secession from the Union and form the Confederate States of America. The departure of the Southerners gave Lincoln's party firm control of Congress, but no formula for compromise or reconciliation was found. And the war came.