https://en.wikipedia.org/wiki/Anthony_Johnson_%28colonist%29

Anthony Johnson was born in Angola and brought to the US to work on a tobacco farm in 1619, technically as an indentured servant. He married a black female servant while on the farm and once freed, maintained his own successful farm with 250 acres and both black and Irish indentured servants. Johnson is best known for not only being one of the first black slave masters, but also for having the court rule in favor of him “holding” slave John Casor indefinitely. This was the first instance of a judicial determination in the Thirteen Colonies holding that a person who had committed no crime could be held in servitude for life.

http://mdroots.thinkport.org/library/anthonyjohnson.asp