I vaguely recall that there was a court case, perhaps in colonial times but maybe later, which was won by a black slave owner. That case established the ownership and slavery for life of another black man. While I believe that the case was heard in Virginia, I may be mistaken on that point.
Michelle Obama’s Slave Ancestry, Ann Romney’s Atheist Immigrant Father & Presidential Identity Politics
http://www.firstladies.org/ancestral-obama.aspx
The recent news, emerging from the new book American Tapestry: The Story of the Black, White, and Multiracial Ancestors of Michelle Obama, by New York Times reporter Rachel L. Swarns, finally provides in a detailed history how the First Lady‘s ancestry, like that of millions of other African-Americans who have had ancestors who were both white slave-owners and black slaves.