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In page History of concubinage in the Muslim world:

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In Morocco, most slaves were black,[citation needed] and the 19th-century American journalist Stephen Bonsal remarked that high ranking Moroccan officials were sons of black concubines.[citation needed] Most Moroccan men remained monogamous as it was too expensive to have a concubine (or second wife),[5] while wealthy Moroccan men took concubines, and the sultans had large harems.[citation needed]