Mayhayley Lancaster (October 18, 1875 – November 22, 1955) was an American lawyer, political activist, midwife and teacher best known for having participated in two of Georgia's most high-profile murder trials, involving defendants Leo Frank in Marietta and John Wallace in Coweta County.
Thirty-two years later, in 1947, the 71-year-old Mayhayley Lancaster took part in the Wallace trial, later described in the book Murder in Coweta County.
She ran on a platform advocating roads and railroads into rural counties, public schools, and the passage of a law that mandated that doctors must deliver babies regardless of the family's ability to pay fees.
In addition to her legal, political and educational activities, she was also described as a noted fortune teller, numbers runner and self-proclaimed "Oracle of the Ages".
Also included is information on Lancaster's role in the trial of John Wallace, subject of the book and movie Murder in Coweta County.