One of Gideon Gibson's descendants was a pro-slavery senator from Louisiana and Civil War hero for the South who attended Yale. (See Daniel Sharfstein's "The Invisible Line."

While living in a small community of expatriates in Saudi Arabia, I met an African American who traced his ancestry to slaves owned by the Pavey family who were light-skinned free African Americans in North Carolina but became white when the moved to Georgia and Texas.
Paul