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In page Westmoreland County, Virginia:

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Robert Carter's grandson, Robert Carter III, is known for voluntarily freeing almost 500 slaves from Nomini Hall, beginning in 1791. He also provided for their settlement on land that he bought for them in Ohio Country.[citation needed] This manumission was the largest known release of slaves in North America prior to the American Civil War and involved the largest number ever manumitted by an individual in the U.S.[3]