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For example:

https://en.m.wikipedia.org/wiki/Barbary_slave_trade

Robert Davis estimates that slave traders from Tunis, Algiers, and Tripoli enslaved 1 million to 1.25 million Europeans in North Africa, from the beginning of the 16th century to the middle of the 18th (these numbers do not include the European people who were enslaved by Morocco and by other raiders and traders of the Mediterranean Sea coast).