Mary Lincoln "Peggy" Beckwith (August 22, 1898 – July 10, 1975) was a prominent descendant of Abraham Lincoln. She was one of the last two descendants (great-grandchildren) of Abraham Lincoln, along with herbrother Robert Todd Lincoln Beckwith.Beckwith was born to Jessie Harlan Lincoln and Warren Wallace Beckwith on August 22, 1898, in Mount Pleasant, Iowa.