Question: Hercules, also known as "Herculas" or "Uncle Harkless", was a slave who worked at Mount Vernon, the plantation house of who, the first President of the United States?
Sentence (from "Hercules (chef)"): Hercules – also known as "Herculas" or "Uncle Harkless" – was a slave who worked at Mount Vernon, George Washington's Virginia plantation on the Potomac River.
Relevant evidence: Yes