Which of the following Presidents' First Lady was named Martha?

As the wife of George Washington, the first President of the United States, Martha Dandridge Custis Washington is considered to be the first First Lady, but the title was not coined until after her death. After George Washington died in 1799, Martha assured a final privacy by burning their letters; she died of “severe fever” on May 22, 1802. Both lie buried at Mount Vernon, where Washington himself had planned an unpretentious tomb for them.

Source: The White House