He was buried in a white cemetery. She was buried in a black cemetery. Their marriage was unheard-of at the time.

Both William Ramey and his wife, Kittie Simkins, were born and raised in Edgefield, S.C., or “Bloody Edgefield,” a town known for its grisly murder rate in the antebellum South. Their relationship defied convention, and yet it survived war and bitter family resentment.

Mr. Ramey, born in 1840, came from a prominent white family. Ms. Simkins was born a slave in 1845, most likely on a property called Edgewood owned by Francis Pickens, who would become a Confederate governor.