Elizabeth McCardle Johnson (October 4, 1810 in Greeneville, Tennessee – January 15, 1876 in Greeneville, Tennessee) was the 22nd First Lady of the United States and the wife of Andrew Johnson, the 17th President of the United States. He credits her in teaching him to do arithmetic and write, having never gone to school himself. She supported her husband in his political career, but had tried to avoid public appearances. Though she lived in the White House, she was not able to serve as First Lady due to her poor health, so her daughters Martha Johnson Patterson, who had often been a guest at the White House during Polk's time in office so was especially skilled as hostess, and Mary Johnson Stover stepped in. For more information visit [http://www.whitehouse.gov/history/firstladies/ej17.html].