Mammy Kate was a woman enslaved by Stephen Heard (1740–1815), the future Governor of Georgia.
In an 1820 letter, she was said to be the "biggest and tallest" Black woman the writer had ever seen and had "proven herself to be a strong, a kindly, a never failing friend to Colonel Heard and his family.
They forced his wife out into a snowstorm, and she and their young, adopted daughter died from exposure.
Telling the sentry on duty that she was there to pick up Heard's soiled linen, she was admitted to his cell.
The previous night, she had secreted two of Heard's Arabian horses—Lightfoot and Silverheels—on the outskirts of Augusta, Georgia, where he was imprisoned.