Was black slave holders significant in the history of slavery?

Answer:

Not to the same degree of historical significance as their Caucasian contemporaries, but from the view of slavery in general, slavery was widely frowned upon; thus anyone who was a slave owner would have had the same level of fame or notoriety, depending on where in the country this question would be asked (particularly, in the 'North' or the 'South' within the United States during that time).

However, in general, African Americans were, regardless of stature (i.e. slave owner, free, indentured servant, slave, etc.) viewed as inferior to their Caucasian counterparts.