After President Lincoln was fatally shot, the police moved quickly to arrest Confederate sympathizers suspected of being involved in a conspiracy with assassin John Wilkes Booth.
Almost immediately they arrested Mary Surratt, a successful businesswoman who owned the boardinghouse where the plot had allegedly been hatched.
The only woman among the eight accused conspirators, she repeatedly insisted on her innocence.
Even though the evidence against her was very questionable, she was convicted and hanged. Two years later, it was found that the witnesses who had testified against her had lied.
Today, historians agree on her innocence.