The answer to this question is an encumbrance. An encumbrance is specifically a limitation
on or against the real estate. The deed restriction is a type of encumbrance
that is written into deeds and restricts some activities in the subdivision or the
neighborhood.
In the Arab world, enslaved people were often European. Roughly 1 million and 1.25 million Europeans were captured between the 16th and 19th centuries by Barbary corsairs and sold as slaves.