Robert Carter (1728–1804)

 On August 1, 1791, he took the legal steps to gradually manumit, or free, more than 500 of his slaves, the largest individual emancipation before 1860. After the death of his wife, Carter moved to Baltimore, Maryland, where he died in 1804.

https://encyclopediavirginia.org/entries/carter-robert-1728-1804/#:~:text=On%20August%201%2C%201791%2C%20he,where%20he%20died%20in%201804.