This article claims that a famous court ruling that codified life-long slavery, was brought by a black slave owner who refused to free his black servant after the typical term of indenture.
http://www.todayifoundout.com/index.php/2013/08/the-first-legal-slave-owner-in-what-would-become-the-united-states-was-a-black-man/
http://www.todayifoundout.com/index.php/2013/08/the-first-legal-slave-owner-in-what-would-become-the-united-states-was-a-black-man/